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To some posting: Quick please notify Stephen Hawking that there are 2 places physics breaks down, Black Holes and inside a doubles tank - but I do not think that Stephen Hawking owes a subscription to Penthouse to anyone on this site! This is not a 'lay person' issue. Most of the mixing will...

1 - The gradient is not that much 32% - 28% and the gas is already 'on the bottom' of the tank so the overall difference is 4% or so. 2 - There will be gas flow during the filling process that will initially equalize some of that gradient. 3 - The heat exchanges will additional have some...

This statement is incorrect. You may want to read up on the behaviors of a gas including Dalton's law and the movement of gas. Each gas molecule , e.g. Oxygen, Nitrogen etc, exerts a partial pressure when combined is the pressure of the vessel. The gas molecules move from areas of higher partial...

bleed off what you need, fill the rest with air. The gas in the tank will mix naturally, just have the manifold open.

I respect Randy Jordan as a captain and operator. I have been on his boat once and thought he was an excellent captain/operation. It is sad to see 3 incidents in the month including 2 lost groups. This is one reason I always (well almost) have a VHF radio on me when I am diving in addition to a...

Yes he does. Please notice in my initial statement "Lines are great but.... Strobes are great but.... Compass is great but.... Depth/layout is great but... Progressive is great but..." that these are many of the tools we were taught. ANY of them can fail and reliance on any ONE of them is a...

Lines are great but.... Strobes are great but.... Compass is great but.... Depth/layout is great but... Progressive is great but... The main point John makes is that there are short comings to every method of navigation in a wreck. Lines get cut, Strobes/lights fail, compass can have...

What difference does it make with regards to logging a dive? I log all of my dives except for pool dives, and even some pool dives get logged if warranted. I am not going pro so they are a personal record only. I do not care if they are shorter, shallower or easier than some perceived minimum...

ACR ResQLink $200 after mail in rebate. You will need a water resistant canister for it which is available on Amazon or ebay.

And the entire team did not fill at the same place???? On OC, I had 3 different tanks often with 2-3 different fills. I am not sure the team is any safer on bad gas here. It is possible everyone is in trouble. So how often have you dumped all of your CCR/BOs or Backgas/Decos because of bad gas...

Bad gas does not happen at the end of a tank (typically) so if it was my back gas, dive terminated early and minimal deco. My planning has always allowed for removal of 1 or 2 of my deco tanks depending on what I was doing. So if both were contaminated, deco on back gas (part of my planning)...

You must really shorten your dives or carry a lot of gas. A typical 180' dive for me is 30 min. BOs ~20/35 and 80 with GF 50/85. For BO I need 38 cf of 20/35 and 35 cf of 80. The OC (using 19/20 or so) will need 47 cf of my 20/35 and 34 cf of my 80. Total needs of 85 cf of 20/35 and 70 cf of...

A CCR diver always plans for a failure of their unit. The idea of 2 failures does not work here IMO. When I donated my 2 BOs to the 2 OC divers, I was very aware of the real risks I put myself into. If I had a CCR failure, I would have a very bad day that could be fatal to me. This is why I...

stuartv - I forgot to mention it but CCR divers will have a deep gas and sometimes a rich gas. For a dive to 150' I might have a 40cf of 25 or even 19/30 with me. Not good for deco but necessary for me get from 150' to the surface with a very long deco penalty or switch to a rich mix if I have...

Your CCR buddy may not have much gas to spare if on BO. I plan all of my dives solo and expect the OCs to do the same. If someone needs my gas, there is very very little to spare and definitely not enough to have my CCR fail at the worst point and then the OC to do the same. I have donated my...

Most of the recreational diving on the SG is above 100' with a significant part of it around 80-90'. Even if he went to the props, he would have had a PPO2 of ~1.6 and a short duration. I do not care to get into a conversation about safety/PPO2 on this thread but I would be very doubtful that...

Deep6 is a direct to consumer manufacturer. Let Chris know the issue. They are going to be getting ready for the Long Beach show this week so I would expect that by Thursday, they will be travelling.

For the gear.... Checkout the Deep6 selection. We have great regs, wings, backplates and fins (disclaimer: my wife works with Deep6/Chris). High quality gear at a good price and direct to the consumer. If you are in the Orlando/Daytona area, we can get them to you to demo sometime when you are...

I am not sure where the range numbers are coming from. The specs for the old radio were 1 Watt with a DSC range of 12.5 km/8 miles. Voice of 4-5 miles. The new radio has AIS @ 1 Watt and DSC @ 1/2 Watt. I would expect the best range of 12.5 km/8 miles in the best of conditions. Considering my...

I have done enough offshore fishing to understand that a significant number of boats do not monitor their radio. The low power of the Nautilus plus being on the surface of the water makes the range terribly short. I did not mind these limitations when the NL had two-way comms as I could know...