Deco time needed for diving the Titanic?

[Akimbo]

On a run of the mill deco model becoming fully saturated takes about 3 days. The converse is also true. Your computer will continue to clock surface time for about 3 days...

Saturation divers have traditionally looked at 24 hours as the round number for “full saturation”. In practice, more than a few hours at 300'+ puts you on a sat decompression table. There isn’t much deep bounce diving done anymore using bell and chamber systems anywhere in the world where a choice like this would have to be made.

There’s a lot a variation but descent rates are in the 1'/minute range for sat divers to minimize HPNS and Compression Neuralgia, down to the 1600' range. That takes five hours just to get to 300'.

…Since this thread started it's gotten me to wondering how much pressure it would take to crush bone cells...

Is there enough gas in bone cells and/or marrow to cause crushing? Bones have been recovered from great depths that didn’t “appear in photographs” to be catastrophically crushed. There is enough gas in cartilage to cause Compression Neuralgia though.

I understand from the “liquid breathing” theories that the major gas-filled spaces like lungs, ears, and sinuses were the only compressible areas in the body. The “theory” was that depth would be unlimited.

 

[rockystock1]

It could be possible to become that negative you sink to 12000 fsw, not saying you would live


Mike

 

[boulderjohn]

I tried to put it into V-Planner, but it would not accept that depth. I'll have to send Ross a complaint about that.

 

[Akimbo]

It could be possible to become that negative you sink to 12000 fsw, not saying you would live…

On average, people without any diving gear are slightly buoyant with a lung full of air at the surface. Nearly everyone is negative by 33'/10M/one atmosphere when breath-holding. Occasionally dead bodies will float up from the 100-200' range as gasses generated by decaying tissue accumulate, but it is pretty rare much deeper than that.

 

[alewar]

First off you need tanks that can hold greater pressure than 380 bars

Not really. A 380 bar cylinders is able to withstand a pressure gradient of at least 379 bars. If you go down to 3,780m, then you can fill another 380 bar in it and so on. You still need some sort of in-water compressor though.

 

[rockystock1]

On average, people without any diving gear are slightly buoyant with a lung full of air at the surface. Nearly everyone is negative by 33'/10M/one atmosphere when breath-holding. Occasionally dead bodies will float up from the 100-200' range as gasses generated by decaying tissue accumulate, but it is pretty rare much deeper than that.

If diver in all his/her gear descended beyond 200mtrs, the compression of suit and air would be so immense it just wouldn't be possible to gain enough lift to return.. So a dive to the titanic would be inevitable

I wonder if a one way trip would be possible? And how long you could have around the wreck


Mike

 

[Akimbo]

…I wonder if a one way trip would be possible? And how long you could have around the wreck…

Doubt it. The terminal velocity of a human body in sea water is pretty low so just getting there could take a long time. I suppose you could build some heavy bullet-shaped object to ride down in, but the chances of hitting the wreck falling from the surface is pretty low without an active guidance system.

The physics alone is pretty daunting on this one, let alone the physiology. I suspect a one-way trip on a Hydrogen-Oxygen mixture is less than 5,000'/1500M. Even a full 300 Bar/4,351 PSI cylinder would likely crush before hitting bottom. It would be hard to suck any gas out of a cylinder with a 90 Bar relative vacuum!

 

[rockystock1]

Such immense pressures it boggles the mind.

The pressure on Venus is around 90 atmospheres which is the highest pressure in our solar system. This is similar to being roughly 1km down in our oceans, the titanic sits at 3.6km..


Mike

 

[alewar]

Doubt it. The terminal velocity of a human body in sea water is pretty low so just getting there could take a long time. I suppose you could build some heavy bullet-shaped object to ride down in, but the chances of hitting the wreck falling from the surface is pretty low without an active guidance system.

The guys of no-limits apnea descend with a sled at about 5m/sec. It would take about 12 minutes to reach the wreck using that method.

 

[hedgehog47]

is it possible for the titanic to be pulled out of the ocean ? or dragged to a part of the ocean with a shallower depth ? realize it's not realistic just wanted to ask an annoying question