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It is a trade-off when having only off board Dil and no onboard dil. So, SM CCRs generally (most but not all don't have onboard Dil) do this but also BM CCRs that configure without any onboard dil.

The part of the cave mentioned is at trimix depths.

So the volunteer pool is their existing membership due to the 1 year requirement. They come here to look for volunteers, but this isn't a good place to promote what they are actually doing? At least we can all agree they are good for some amusement.

You are only thinking of the example of using the O2 for <20 ft on OC. This could lead to very bad things if it was used as an O2 bottle for a CCR.

You know the one in your mouth works because you are currently breathing it. You literally just took a breathe from it. The one on your necklace, you think works and should work, but you haven't necessarily tested in the past 30 seconds. Your buddy needs gas now. You need gas soon, but not as...

What gear are you going to dive? If not SM or SM CCR then scratch Abaco off your list.

I was just stating the reason no one understood how you had your bolts setup in your bands. It is non-standard, but if you have a good reason and understand the risks do as you need. The only hazards I can see with it there is it falling off (fairly low risk) or the wingnuts getting...

Most people put the weight in between the backplate and the tanks rather than the opposite side that you have shown here.

Do yourself a huge favor: Stay out of the springs until you have more experience and have the appropriate cave training for the dive you intend to make. Obviously the temptation is too great once there.

Good looking stretch of cave and some really nice quality video. Wish I could see it firsthand. Most of the cave in the general area (not just from wakulla entrance) has the deep/dark reputation but there are many of sections that are anything but.

Thanks. The overlay is pretty interesting. I am not sure when it will get released. I'd say it depends on a few things.

A group of us have been quietly growing the known expanses of the Jackson Blue cave system. The original map by Sheck Exley contains most of what people think of as JB. More than 10 years ago, work began on a section that became commonly referred to as JB2. Those efforts ended in late 2014 due...

Your metabolic rate does not vary with depth. Why would you want your O2 addition to vary with depth?

Yea, you are missing a bit. The needle valve is just an adjustable orifice. It can be run with a blocked or unblocked 1st stage. There are pros and cons to each method but diving it blocked removes the variability of O2 flow vs depth. With an unblocked 1st: diving a square profile it makes...

Your stops are in 10 ft buckets. Say the algorithm spits out a 93 ft ceiling at sea level and a 95 ft ceiling at altitude. The implementation still spits out a first stop at 100 ft.

Not sure why that would matter as they allow OW divers in the ballroom, but perhaps common sense does not apply. I really hope the requirements creep does not catch on at other locations.

I've never thought to myself that I really need a better way to manage the line when dealing with a spool. Now to be honest I use reels more often than spools but I used to favor spools at one time. My lines including primary reel have nothing on the ends, as they end up staying in the cave for...

That's you argument? I see that a bit differently and don't think it is a SM specific issue at all. Replace the word sidemount above with "CCR" or "cave" and we can have the exact same argument today. Are you saying tech diving in general is being over sold? That is different than SM is being...

Right, I've reviewing it and saying it is in error.

I'm referring specifically to the example in your pdf. (cell reads 10mV in air, 43mV at 1.0, and 65mV at 1.6) where you correctly state 15% linear drift (@1.6 reference) from air. You then state with a setpoint of 1.4 you could easily be above 1.6. I'm saying the math there is incorrect and your...