SCUBA Diving, Urban Legends and Mythbusters

[Cave Diver]

Every so often a thread pops up about a topic that someone has "heard" from a buddy, or some flash of enlightenment that has occurred to them from an experience they've had.

A while back Mythbusters did some shows on stuff that could be considered diving related (exploding tank, shark week, etc.)

I thought it might be fun if we put together a list of some of those things we've all heard, but no one has ever really tried. Then maybe we can get Mythbusters to do a ScubaBoard special. :rofl3:

I'll start with a few:

In the event of a first stage failure you can take the reg off a tank and sip air directly from the valve.

A ruptured low pressure hose will drain a tank before you can shut the valve off.

You can use a wing as rebreather in an emergency.

A BP/W will float you face down and you'll die. :D

Ok, so I'm kidding about that last one (maybe) but you get the idea.

Any other contributions?

[vjanelle]

Reading **** on the internet makes you an expert?

Maybe we can finally end the myth of the safeair being something worth buying?

[HowardE]

Is this like, "don't exceed 1.4 PPO2 or you'll die?"

[mike_s]

Every so often a thread pops up about a topic that someone has "heard" from a buddy, or some flash of enlightenment that has occurred to them from an experience they've had.

A while back Mythbusters did some shows on stuff that could be considered diving related (exploding tank, shark week, etc.)

I thought it might be fun if we put together a list of some of those things we've all heard, but no one has ever really tried. Then maybe we can get Mythbusters to do a ScubaBoard special. :rofl3:

I'll start with a few:

In the event of a first stage failure you can take the reg off a tank and sip air directly from the valve.

A ruptured low pressure hose will drain a tank before you can shut the valve off.

You can use a wing as rebreather in an emergency.

A BP/W will float you face down and you'll die. :D

Ok, so I'm kidding about that last one (maybe) but you get the idea.

Any other contributions?


You forgot Spare Air. :thumb:


hmm.... this has got me going I would love to see a tank explode (http://www.scubaboard.com/forums/surface-interval/50551-i-would-love-see-tank-explode.html)

[Cave Diver]

Is this like, "don't exceed 1.4 PPO2 or you'll die?"

I was thinking more along the lines of "diving with a metal detector will attract sharks" but sure, we can throw 1.4 in too. :)

[AuburnFan]

:popcorn: :popcorn:

[sabbath999]

Don't forget everybody's favorite: If you get in the water wearing split fins you will instantly die.

[TC]

Why hasn't Letterboy asked to see an exploding tank yet?

[Docc]

Any clips from Home Depot or Lowes will kill you. Clips from KMart will kill you AND your buddy.

[Cave Diver]

hmm.... this has got me going I would love to see a tank explode (http://www.scubaboard.com/forums/surface-interval/50551-i-would-love-see-tank-explode.html)

NkhtTPU9KjM

[Randy43068]

Docc is correct, as usual.

[HowardE]

I was thinking more along the lines of "diving with a metal detector will attract sharks" but sure, we can throw 1.4 in too. :)

We all know that's not true... But if you pee in your wetsuit - it does attract sharks.

[Randy43068]

Don't forget everybody's favorite: If you get in the water wearing split fins you will instantly die.

You know it!!

[Cave Diver]

Any clips from Home Depot or Lowes will kill you. Clips from KMart will kill you AND your buddy.

And flip flops.

[mike_s]

Why hasn't Letterboy asked to see an exploding tank yet?

I took care of that for him in post #4 :thumb:




And flip flops.

:rofl3:

new monitor please!

[Randy43068]

Why hasn't Letterboy asked to see an exploding tank yet?

He's busy doing whatever it is that he does.

[Cave Diver]

We all know that's not true... But if you pee in your wetsuit - it does attract sharks.

That's a good one!

[Randy43068]

We all know that's not true... But if you pee in your wetsuit - it does attract sharks.

No Howard, that's ONLY if you're diving in shark infested waters.

[Randy43068]

diving doubles will certainly kill you, too.

You have to be an experienced tech diver to use a back plate and wing.

[Docc]

Is the thing about LB and the goat true or is that an urban myth?

[Randy43068]

Is the thing about LB and the goat true or is that an urban myth?

Oh my gawd, I don't even wanna think about that! I bet it's true though.

[HowardE]

No Howard, that's ONLY if you're diving in shark infested waters.

Land Sharks?

[Teamcasa]

And flip flops.

Or Flip fins! :D

How about plastic buckles are a failure point and you will die if your BC has them.


Say, Just who is volunteering to do these test anyway? Won't the detractors just boo hoo and results anyway?:rofl3:

[Randy43068]

using an unnamed glove will allow one to swim faster in a serious rescue situation.

[tridacna]

If you buy gear from LeisurePro, you will die when the gear gets wet and all the LDS's in the USA will instantly go out of business. And you will never be able to get air fills again.

[Randy43068]

Land Sharks?

Maybe! :) That's a good one that you mentioned by the way.

[Randy43068]

If you buy gear from LeisurePro, you will die when the gear gets wet and all the LDS's in the USA will instantly go out of business. And you will never be able to get air fills again.

Hey, that's true! :lotsalove:

[Teamcasa]

using an unnamed glove will allow one to swim faster in a serious rescue situation.

Only in the event of a flip fin entanglement or a jacket BC falling off at 100' due to a buckle failure.:rofl3:

[Randy43068]

Or Flip fins! :D

How about plastic buckles are a failure point and you will die if your BC has them.


Say, Just who is volunteering to do these test anyway? Won't the detractors just boo hoo and results anyway?:rofl3:

Who would do such a thing? :cool2:

[mike_s]

if you fart in your drysuit, it causes buoyancy issues that make you instantly rocket to the surface I heard. :thumb:

[tridacna]

if you fart in your drysuit, it causes buoyancy issues that make you instantly rocket to the surface I heard. :thumb:

Actually the opposite. The drop in buoyancy will make you s(t)ink like a stone!

[Cave Diver]

Say, Just who is volunteering to do these test anyway? Won't the detractors just boo hoo and results anyway?:rofl3:

I was thinking that if we got enough semi-legitimate submissions, we'd turn them over to mythbusters. Unless someone else has a video camera and want's to volunteer to try them? :D




In the event of a first stage failure you can take the reg off a tank and sip air directly from the valve.

A ruptured low pressure hose will drain a tank before you can shut the valve off.

You can use a wing as rebreather in an emergency.

Spare Air is adequate for a safe ascent from 130'

"diving with a metal detector will attract sharks"

if you pee in your wetsuit - it does attract sharks.

[iztok]

Long hose system is for tech diving only.

[Docc]

I can dispute that pharting in a wetsuit causes any variation in buoyancy. I have performed this experiment personally. Busted.

[Randy43068]

you want to ditch your weight at 100' when you run out of air so you can get to the top in a hurry. assuming no spare air is available.

[mike_s]

I can dispute that pharting in a wetsuit causes any variation in buoyancy. I have performed this experiment personally. Busted.


Busted?

you Busted your wetsuit when farting in it?


(note to Docc, no more bean burritto's before diving :thumb: )

[Teamcasa]

I was thinking that if we got enough semi-legitimate submissions, we'd turn them over to mythbusters. Unless someone else has a video camera and want's to volunteer to try them? :D


I have the camera and would be happy to film a pilot or teaser reel for submission.;)

[Cave Diver]

How could I forget this one?

You can't use titanium with nitrox (for all those that want to see a tank explode) :rofl3:



In the event of a first stage failure you can take the reg off a tank and sip air directly from the valve.

A ruptured low pressure hose will drain a tank before you can shut the valve off.

You can use a wing as rebreather in an emergency.

Spare Air is adequate for a safe ascent from 130'

"diving with a metal detector will attract sharks"

if you pee in your wetsuit - it does attract sharks.

Plastic buckles are a more prone to failure.

using a webbed glove will allow one to swim faster in a serious rescue situation.

Titanium regs will blow up if used with nitrox

[Cave Diver]

I have the camera and would be happy to film a pilot or teaser reel for submission.;)

It's a shame I didnt think about this before my friends flew home with his video camera!

Dang Dave, you may have to make a trip. :rofl3:

[Teamcasa]

How about:
If you fill a tank with Nitrox, it must be O2 clean first or the whole shop will blow up.
or
Will water get into a tank if it is brought back on board with only 100 psi.
or
How dirty can a tank be before it will explode when filling with pure O2.

[Teamcasa]

Dang Dave, you may have to make a trip. :rofl3:

Let's get the volunteer divers and I'll work something out.;) or we can just do the testing here in the lovely Catalina waters.;)

[Blackwood]

Don't forget diving's biggest myth: drysuits.

[I Dive]

SCUBA diving is an awesome way for a person to get over their fear of water!

[kjvander]

if you dive with equipment on retractors....you will die.

[Teamcasa]

You lose 90% of your body heat through your head.

[Cave Diver]

How about:
If you fill a tank with Nitrox, it must be O2 clean first or the whole shop will blow up.
or
Will water get into a tank if it is brought back on board with only 100 psi.
or
How dirty can a tank be before it will explode when filling with pure O2.

:thumb:

[Cave Diver]

if you dive with equipment on retractors....you will die.

Debunked. I just spent two weeks diving with someone with gauges on a retractor and in spite of my best efforts she not only survived, but enjoyed the trip immensely! ;)

[Cave Diver]

You lose 90% of your body heat through your head.

We'll have to try that one in Catalina. It's not cold enough here to verify. Water temp is averaging 88*


Don't forget diving's biggest myth: drysuits.

We'll have to save that one for Catalina also. Bet we can come up with some p-valve myths as well... :hm:

[Teamcasa]

If you take a e-learning class, you will not learn anything.

[Teamcasa]

Does the air pressure on the INSIDE of a scuba tank increase as the diver ascends?

[I Dive]

If you take a e-learning class, you will not learn anything.

This one doesn't count, too many people accept this as fact.. :D

[Paladin]

Actually, you lose 60% of your body heat through your head!:D

[kjvander]

Does the air pressure on the INSIDE of a scuba tank increase as the diver ascends?

depends....does the pressure decrease as they descend.....minus the breathing....i could work out the formulas....but i am too lazy....

just remember PV=nRT

[iztok]

Actually, you lose 60% of your body heat through your head!:D

Well truth is actually less then 10%.

[Paladin]

The absolute pressure inside the tank does not change with depth. However, the effect of that pressure can change with a change in outside pressure.. If you have 150 PSI in a tank at the surface (sea level), then there is a pressure difference of about 135 PSI and the air in the tank is usable (down to sea level air pressure). But at a depth where the pressure outside the tank is also 150 PSI, then the tank is "empty." As the diver ascends, the external pressure drops, causing a pressure differential that allows some of the air to be used.

10%? Really? My drill sergeant told us it was 60%.

[MaxBottomtime]

If you make a surface swim in a lake you will be picked up by a water-dropping helicopter and dropped in the middle of a forest fire.

Nitrox make you feel less tired.

The pee will rinse out of your wetsuit.

All diving deaths are a direct result of solo diving.

You should continue classes and become an instructor by the time you have 100 dives.

[gbray]

Is a shart more dangerous in a wet suit or a dry suit?

[kjvander]

The absolute pressure inside the tank does not change with depth. However, the effect of that pressure can change with a change in outside pressure.. If you have 150 PSI in a tank at the surface (sea level), then there is a pressure difference of about 135 PSI and the air in the tank is usable (down to sea level air pressure). But at a depth where the pressure outside the tank is also 150 PSI, then the tank is "empty." As the diver ascends, the external pressure drops, causing a pressure differential that allows some of the air to be used.

10%? Really? My drill sergeant told us it was 60%.

technically if you take into account the temperature gradient as well there will be a slight depressurization and repressurization of an unused cylinder of air during a dive. Albiet small there will be a pressure fluctuation due to the surface temperature and the bottom temp....now where you are diving there will of course be a difference in these as with the Great Lakes can be 75 at the top and 40 at the bottom there will be some decrease in pressure....like i said though i am too lazy to work out what the % of pressure loss is due to a temperature gradient.

however you are right....the external pressure to the tank will not affect the internal pressure.....

[KBeck]

OK, I'm going to regret bringing this one back up, but the ever favorite female question--
If I dive during that time of the month, will sharks attack me?
or, the opposite:
Menstrual blood is "dead" blood and therefore does not attract sharks.

While not a particularly appealling myth to test on public television, it's reasonably testable without putting an -ahem- real test subject in the water---any diver, with testable collected fluids could theoretically work.

[ligersandtions]

You will die if you dive with a steel tank and a wetsuit.

[I Dive]

PADI has a top secret plan to take over the world with an army of OW instructors. That's the main reason behind them developing their E-learning program.

[Blackwood]

Does the air pressure on the INSIDE of a scuba tank increase as the diver ascends?

No, it decreases.

And I'm not being a jackass. Even if you hang a tank from a rope with the valve shut, the pressure will increase as you lower it and increase as you hoist it up.

A scuba cylinder isn't perfectly rigid. As the ambient pressure increases, so does the force compressing the cylinder, which reduces (ever so-slightly) the internal volume. Not much, mind you, but technically speaking...

[Cave Diver]

Nitrox make you feel less tired.

The pee will rinse out of your wetsuit.

Those two are good.

[Tom Smedley]

To prove that you would have to measure it with a micrometer, mark it with chalk, and cut it with an axe.


No, it decreases.

And I'm not being a jackass. Even if you hang a tank from a rope with the valve shut, the pressure will increase as you lower it and increase as you hoist it up.

A scuba cylinder isn't perfectly rigid. As the ambient pressure increases, so does the force compressing the cylinder, which reduces (ever so-slightly) the internal volume. Not much, mind you, but technically speaking...

[Lead_carrier]

Originally Posted by Paladin954
Actually, you lose 60% of your body heat through your head!


Well truth is actually less then 10%.

Actually, according to which study you want to believe, it can have a very wide range.

Heat Loss Through the Head and Hypothermia Wilderness Medicine Newsletter (http://wildernessmedicinenewsletter.wordpress.com/2007/02/14/heat-loss-through-the-head-and-hypothermia/)

Re: How much heat is loss thru head? (http://www.madsci.org/posts/archives/2000-12/978077909.Ns.r.html)

Heat Losses From the Human Head -- Froese and Burton 10 (2): 235 -- Journal of Applied Physiology (http://jap.physiology.org/cgi/content/abstract/10/2/235)

It's keeps going and going and going.

[jeffloughridge]

[QUOTE=Blackwood;4721921]

Even if you hang a tank from a rope with the valve shut, the pressure will increase as you lower it and increase as you hoist it up.

Sounds like you have the secret to a perpetual dive machine. :D

[mike_s]

and the one you hear from overpriced LDS's the most...


If you buy it in the internet it's fake or not from an authorized dealer. Remember IT'S LIFE SUPPORT EQUIPMENT

[iztok]

Actually, according to which study you want to believe, it can have a very wide range.

Heat Loss Through the Head and Hypothermia Wilderness Medicine Newsletter (http://wildernessmedicinenewsletter.wordpress.com/2007/02/14/heat-loss-through-the-head-and-hypothermia/)

Re: How much heat is loss thru head? (http://www.madsci.org/posts/archives/2000-12/978077909.Ns.r.html)

Heat Losses From the Human Head -- Froese and Burton 10 (2): 235 -- Journal of Applied Physiology (http://jap.physiology.org/cgi/content/abstract/10/2/235)

It's keeps going and going and going.

Not really. All have rather low percentage compared to the myth.

[Blackwood]

To prove that you would have to measure it with a micrometer, mark it with chalk, and cut it with an axe.

(Or measure with a strain gauge)

[Kevrumbo]

and the one you hear from overpriced LDS's the most...


If you buy it in the internet it's fake or not from an authorized dealer. Remember IT'S LIFE SUPPORT EQUIPMENT
Well then . . .you'd better learn how to service/repair the gear yourself.

[Coldwater_Canuck]

If you go night diving on Friday the 13th when there is a full moon in a lake full of nuclear waste adjacent to a haunted house, you will lose a fin.

[elmer fudd]

Seems to me, that you should still be breathing while you make your ascent, therefore there should be less pressure in your tank when you reach the surface.

[gcbryan]

You should buy a dive computer you can grow into ... that way you'll never need to buy another one.

Sharks are attracted to divers riding scooters because of the electo-mechanical signal given off.

All scuba gear is life support and therefore you should spend as much as possible on it.

You couldn't survive without the advice from your LDS so it's incumbent on you to make sure they survive.

You want to make sure you check your buoyancy at the start of every dive with a good fin pivot.

If you have any problem underwater, immediately get negative and plant yourself on the bottom to deal with the situation. It's more stable that way.

[tridacna]

If you bring a banana on a boat, the captain will go bananas.

[300bar]

When your drysuit floods you'll sink and die.

Busted,been there done that.:D



PADI has a top secret plan to take over the world with an army of OW instructors. That's the main reason behind them developing their E-learning program.
You better start hidding,the PADI MIB will be after you shortly.:rofl3:

[Docc]

If I wear my THREE WOLF MOON tshirt on a dive trip, the local bimbettes will rape me.

http://i674.photobucket.com/albums/vv102/thedoccdave/three-wolf-moon.jpg

[Rick Inman]

Here's one I believed and have of late busted myself:

Because rebreathers use so much less gas, they will save you money.

:rofl3:

Here's another one I have busted:

You can't learn anything about diving on the internet - only from a paid instructor.

One more:

Argon is a placebo.

[Randy43068]

one has to have a drysuit certification to dive one

You need to be certified to change a regulator hose

[Cave Diver]

Here's one I believed and have of late busted myself:

Because rebreathers use so much less gas, they will save you money.

:rofl3:


You're not diving deep enough. ;)

[NetDoc]

We all know that's not true... But if you pee in your wetsuit - it does attract sharks. You only have to worry about that when you're menstruating Howard! :D

[leapfrog]

If all your equipment isn't black, you're not a serious diver.

[Randy43068]

If all your equipment isn't black, you're not a serious diver.

which is true by the way. :D :D

[Randy43068]

NITROX is a deep diving gas

[Cave Diver]

Bungied wings cause turbulence in the water, creating drag.

You can't orally inflate a bungied wing at depth.

[leapfrog]

Go Pro and LIVE THE DREAM!

[Cave Diver]

Go Pro and LIVE THE DREAM!

:rofl3:

[mike_s]

If I wear my THREE WOLF MOON tshirt on a dive trip, the local bimbettes will rape me.

http://i674.photobucket.com/albums/vv102/thedoccdave/three-wolf-moon.jpg




Have you ever read the purchase reviews of that shirt on Amazon?

It's so damn funny you'll spew your coffee on your monitor


see Amazon.com: Customer Reviews: The Mountain Men's Three Wolf Moon Short Sleeve Tee (http://www.amazon.com/Mountain-Mens-Three-Short-Sleeve/product-reviews/B002HJ377A/ref=cm_cr_dp_all_summary?ie=UTF8&showViewpoints=1&sortBy=bySubmissionDateDescending)

[Cave Diver]

Have you ever read the purchase reviews of that shirt on Amazon?

It's so damn funny you'll spew your coffee on your monitor


see Amazon.com: Customer Reviews: The Mountain Men's Three Wolf Moon Short Sleeve Tee (http://www.amazon.com/Mountain-Mens-Three-Short-Sleeve/product-reviews/B002HJ377A/ref=cm_cr_dp_all_summary?ie=UTF8&showViewpoints=1&sortBy=bySubmissionDateDescending)

Yeah, there was a thread started about it here a while back. I believe it was H2Andy that started it. Those reviews are a total classic! :rofl3:

[Docc]

Yeah, there was a thread started about it here a while back. I believe it was H2Andy that started it. Those reviews are a total classic! :rofl3:


I actually have the shirt.

[tasdiver]

Go Pro and LIVE THE DREAM!

:rofl3::rofl3::rofl3::rofl3::rofl3::rofl3::rofl3:: rofl3::rofl3::rofl3:

[tasdiver]

You will die if you dive with a steel tank and a wetsuit.

dang, I'm dead and this is heaven :depressed:

[Cave Diver]

I actually have the shirt.

Was this your review?

i like this t-shirt because it has 3 wolves on it. 3 wolves is much better than 1 wolves and also better than two wolves. 4 wolves would be two much. 3 budgies would be rubbish!!! 3 dragons would probably be better than 3 wolves but they probably couldn't fit 3 dragons on 1 t-shirt. the planet mars might be better than the moon, but 3 wolves are unlikely to howl at mars because it's too small.

i'm on meds.

[Docc]

Was this your review?

i like this t-shirt because it has 3 wolves on it. 3 wolves is much better than 1 wolves and also better than two wolves. 4 wolves would be two much. 3 budgies would be rubbish!!! 3 dragons would probably be better than 3 wolves but they probably couldn't fit 3 dragons on 1 t-shirt. the planet mars might be better than the moon, but 3 wolves are unlikely to howl at mars because it's too small.

i'm on meds.


I'm not sayin.....did you see the video on youtube about it?:rofl3:

[Cave Diver]

I'm not sayin.....did you see the video on youtube about it?:rofl3:

Here is the thread, the video is around post 36. There is also an ABC news article about it. http://www.scubaboard.com/forums/pub/286559-three-wolves-howl-moon-t-shirt.html

[mike_s]

I actually have the shirt.


so is this you? (did this happen when you got your Three Wolves T-shirt?)

QPB45AUmchM

[Cave Diver]

Urban legend: 3 wolf t-shirt will make you DIR.

[Cave Diver]

A 7' hose will cause a decrease in regulator performance.

A 7' hose will give you a couple of extra breaths if you go OOA due to the extra volume.

[mongodives]

some of my favorite myths from SB
if you haven't taken GUE fundamentals you'll die
if you don't use spring straps you'll die
if you wear a vest BC you'll die
if you call a BC a BC not a BCD you'll die
if you don't have a crotch strap on your BC you'll die
if you don't have (enter c-card specialty) you'll die
if you don't aspire to be a tech diver you'll die
if you dive in water that is gin clear and piss warm you're not a real diver
You'll get sued if you show DM or Instructor card when on vacation
Experience is only gained during a paid course

Some of the ones I've heard when on vacation
pissing in a wetsuit ruins it (especially if its a rental)
you can't seal a mask with a beard or mustache

[I Dive]

HOG Rig or die...

[Abidon]

What about the dangers of using titanium regs with nitrox? :vintagediver: causes :losecool:
:duck:

[ocbeachbum]

Upon getting wet, your snorkel will get caught in a rope, fishing line, old net, anchor line, bra strap, or commercial long line, causing you to be dragged miles out to sea where it will somehow become wrapped in kelp --forcing you to take off your mask to untagle everything --then you will die.

[engdiver]

This one is not really SCUBA, but it is diving.
The early hard hat divers did not have a check valve on their air supply lines and if the air ran out the water pressure would force their bodies up into the helmet!

[jtpwils]

Does the air pressure on the INSIDE of a scuba tank increase as the diver ascends?

No and no. It actually increases VERY little because the tank itself expands due to the decrease in surrounding pressure. Thus the volume increases minutely causing a minute pressure drop. It also drops if your breathing. ;)

[Cave Diver]

Lets not forget the myth that all non-divers think we see sharks and sunken treasure galleons one every dive.

[Abidon]

Lets not forget the myth that all non-divers think we see sharks and sunken treasure galleons one every dive.

You don't?! :confused:

[300bar]

You don't?! :confused:

:rofl3:

[Teamcasa]

Myth:
A huge knife strapped to your leg will kill you but a butter knife slipped into a sleeve on your belt will save your life.

Fact:
Don't show up at a gun fight with either one.

[mike_s]

Don't forget that drinking Ice Tea at certain dive resorts will cause Decompression Symptons :shocked:

[Cave Diver]

Don't forget that drinking Ice Tea at certain dive resorts will cause Decompression Symptons :shocked:

:confused: Is there a story there? That's a new one on me.

[Docc]

:confused: Is there a story there? That's a new one on me.

Ask DD.....:rofl3::rofl3::rofl3::rofl3:

[mkutyna]

In the event of a first stage failure you can take the reg off a tank and sip air directly from the valve.


I haven't wanted to screw up a regulator by taking it off a tank underwater but I have swam around with just a tank, sipping from the valve without a problem. Just like drinking from a water fountain.

Tank Rodeo is pretty fun. Pinch a tank between your legs, crack the valve and let it push you around in the water.

I'm still trying to perfect the following scuba prank. Get a bunch of cylinders and put them at the bottom of a pool while the victim is on the surface talking to their students. Have some friends help open the tank valves at the same time. I'm trying to get enough air coming out so the person sinks to the bottom but all that is happening with 3 tanks so far is that the person on the surface gets pushed to the side. We're going to try 6 tanks next time.

Sorry, these aren't really myths.. just a bunch of bored people with access to lots of tanks.

[Cave Diver]

I haven't wanted to screw up a regulator by taking it off a tank underwater but I have swam around with just a tank, sipping from the valve without a problem.

My biggest issue with the the "remove faulty first stage myth" is that if it fails in such a way that it wont deliver any air (unlikely) how are you going to relieve the pressure on it in order to take it off the valve while under OOA stress in the first place?

[Teamcasa]

My biggest issue with the the "remove faulty first stage myth" is that if it fails in such a way that it wont deliver any air (unlikely) how are you going to relieve the pressure on it in order to take it off the valve while under OOA stress in the first place?

You could do it like they do in the movies, just whip out your Bowie knife and whack the valve off in one clean stroke. ;)

[Cave Diver]

You could do it like they do in the movies, just whip out your Bowie knife and whack the valve off in one clean stroke. ;)

Can't. Big Bowie knife on my leg is tangled up in a bunch of kelp and I can't get to it.

[Cave Diver]

Tank Rodeo is pretty fun. Pinch a tank between your legs, crack the valve and let it push you around in the water.


Hmmm, I think that was in a James Bond movie. Might have to include the "tank scooter" in the list...

[Teamcasa]

Can't. Big Bowie knife on my leg is tangled up in a bunch of kelp and I can't get to it.

:rofl3: :rofl3: :rofl3:

[mike_s]

Ask DD.....:rofl3::rofl3::rofl3::rofl3:

I figured someone would get a good laugh out of that! :thumb:

[I Dive]

Can't. Big Bowie knife on my leg is tangled up in a bunch of kelp and I can't get to it.

Use your back up knife to sever that leg from your body so you can get access to your Bowie knife.:D

[tridacna]

Don't forget that drinking Ice Tea at certain dive resorts will cause Decompression Symptons :shocked:

That's LONG ISLAND ICED TEA.

[NetDoc]

That's LONG ISLAND ICED TEA.Just avoid Long Island then. :D

[tridacna]

Just avoid Long Island then. :D

Oh I try. Believe me. But with two sets of in-laws out there...I wish. This is when Long Island Ice Teas become useful.

[leapfrog]

Instructors get all the chicks...

[Cave Diver]

Instructors get all the chicks...

I believe the above has some relation to the following. ;)


Go Pro and LIVE THE DREAM!

[CWSWine]

Instructor ask student “Are you sure you have enough weight to maintain a 15 foot safety stop?”

Student “I think so but I throw a couple extra four pound weights in my BC pocket that way I can put them on weight belt if I need them.”

[DaleC]

DIR was really started by the Hare Krishnas

[Zeke XA3]

hmm someone mentioned the Urban Legend of not using Titanium reg for nitrox at 40% or above,
this is still listed in the latest edition of TDI - Advanced Nitrox but with no explanation why.

If this is an urban myth.....have the entire TDI staff been taken in??

Urban Myth spread by warm water divers ... (i currently work in mexico to give these context)
"There are no divers in England"
"But you cant dive in England its cold"
"its no fun diving in anything in cold water"
"Barracudas eat anything shiny, even if it is attached to something several hundreds times its mass

[pittyyofool]

DIR is really better.
and
If you DIW you will die.

you need an safe second (octo).

"hot" fills make tanks crack.

the lead in non-coated dive weights, cause great environmental harm

[Cave Diver]

hmm someone mentioned the Urban Legend of not using Titanium reg for nitrox at 40% or above,
this is still listed in the latest edition of TDI - Advanced Nitrox but with no explanation why.

Titanium is supposed to be susceptible to autoignition in the presence of high pressure oxygen. I proposed it as a myth to verify the actual % that combustion would take place at. I suspect it's substantially higher than 40%, but that figure is used since higher percentages of nitrox tend to fall outside the recreational diving range.

Plus, wouldnt you like to see a tank explode? ;)

[I Dive]

DIR was really started by the Hare Krishnas
:rofl::biggrin3::rofl3::rofl3::rofl3:

[Saudi-Diver]

How about drinking 5 beers a night for 3 weeks before your Liveaboard Dive Holiday increases your tolerence to Narcosis

[I Dive]

How about drinking 5 beers a night for 3 weeks before your Liveaboard Dive Holiday increases your tolerence to Narcosis

I have some friends who despise a diveshop named Narcosis, so they might actually agree with this!:D

[NetDoc]

Your dive count be should greater than your post count.

You should buy a BP & Wing first.

and...

Attending DEMA will help your business!

[Cave Diver]

Attending DEMA will help your business!

:rofl3:

[I Dive]

If you place your mask on your forehead when not actually in distress, you will die.

Masks are designed so that, the exact instant you place them on your forehead, an ambulance and rescue helicopter will be deployed to assist you because everyone knows a diver only puts their mask on their forehead when they are in serious distress. The nearest Chamber will also be automatically activated.

[boulderjohn]

How about drinking 5 beers a night for 3 weeks before your Liveaboard Dive Holiday increases your tolerence to Narcosis

That (or the equivalent) is why I never have to worry about narcosis.

[vrykolakas]

How about drinking 5 beers a night for 3 weeks before your Liveaboard Dive Holiday increases your tolerence to Narcosis

you mean I've been getting sloshed for nothing?

[NetDoc]

you mean I've been getting sloshed for nothing?Possibly. But I have my own reasons for getting sloshed. :D



Posted via Mobile Device

[vrykolakas]

Possibly. But I have my own reasons for getting sloshed. :D



Posted via Mobile Device

yeah, but if I tell people that, they won't think I'm an alcoholic... ;)

[Cave Diver]

Ok, we've had some good suggestions and a lot of fun. I've narrowed the results down to some of the ones that I think were among the best and actually capable of being put to a test.

I'm posting the "winners" here and later I'll go back and "clean up" the wording a bit. Then I'll propose some thoughts on how we might verify some of them.

If anyone wants to add some more suggestions, now is the time!



In the event of a first stage failure you can take the reg off a tank and sip air directly from the valve.

A ruptured low pressure hose will drain a tank before you can shut the valve off.

You can use a wing as rebreather in an emergency.

Spare Air is adequate for a safe ascent from 130'

"diving with a metal detector will attract sharks"

if you pee in your wetsuit - it does attract sharks.

Plastic buckles are a more prone to failure.

using a webbed glove will allow one to swim faster in a serious rescue situation.

Titanium regs will blow up if used with nitrox

you fill a tank with Nitrox, it must be O2 clean first or the whole shop will blow up.

Will water get into a tank if it is brought back on board with only 100 psi.

How dirty can a tank be before it will explode when filling with pure O2.

Does the air pressure on the INSIDE of a scuba tank increase as the diver ascends?

Nitrox make you feel less tired.

The pee will rinse out of your wetsuit.

Menstrual blood is "dead" blood and therefore does not attract sharks.

Sharks are attracted to divers riding scooters because of the electo-mechanical signal given off.

Bungied wings cause turbulence in the water, creating drag.

You can't orally inflate a bungied wing at depth.

7' hose will cause a decrease in regulator performance.

A 7' hose will give you a couple of extra breaths if you go OOA due to the extra volume.

pissing in a wetsuit ruins it (especially if its a rental)

you can't seal a mask with a beard or mustache

The early hard hat divers did not have a check valve on their air supply lines and if the air ran out the water pressure would force their bodies up into the helmet!

Don't forget that drinking Ice Tea at certain dive resorts will cause Decompression Symptons

I'm still trying to perfect the following scuba prank. Get a bunch of cylinders and put them at the bottom of a pool while the victim is on the surface talking to their students. Have some friends help open the tank valves at the same time. I'm trying to get enough air coming out so the person sinks to the bottom but all that is happening with 3 tanks so far is that the person on the surface gets pushed to the side. We're going to try 6 tanks next time.

Masks are designed so that, the exact instant you place them on your forehead, an ambulance and rescue helicopter will be deployed to assist you because everyone knows a diver only puts their mask on their forehead when they are in serious distress.

[Drew Sailbum]

Your dive count be should greater than your post count.

And yours isn't?


Another thing to test which should be verifiable...

There is a depth at which the water pressure would equal the air pressure inside even a full tank. If you open the valve at that depth, the water pressure holds the air in. (Might need a deep sea submersible to test this witha full tank.)

[Cave Diver]

And yours isn't?


Another thing to test which should be verifiable...

There is a depth at which the water pressure would equal the air pressure inside even a full tank. If you open the valve at that depth, the water pressure holds the air in. (Might need a deep sea submersible to test this witha full tank.)

Or a big pressure pot.

[Cave Diver]

One more to add: Nitrox is less narcotic than air.

[ScubaTigress]

Bump :D