Taboo Decompression

[johndiver999]

Youre completely missing the main point he was making. His point was rather than trying to fix it yourself underwater where nobodys there to help, you're better off breathing oxygen on the surface while waiting for help to arrive or while you drive back to the dock. The main point is finding the safest way to get yourself appropriate help.
If you're doing deco dives solo off a boat far enough away you can't count on the coast guard getting to you or you getting back to shore, then you should not be doing those dives. That is the complete opposite of

Youre completely missing the main point he was making. His point was rather than trying to fix it yourself underwater where nobodys there to help, you're better off breathing oxygen on the surface while waiting for help to arrive or while you drive back to the dock. The main point is finding the safest way to get yourself appropriate help.
If you're doing deco dives solo off a boat far enough away you can't count on the coast guard getting to you or you getting back to shore, then you should not be doing those dives. That is the complete opposite of risk mitigation.

This is silly, people dive in remote areas, if you are too scared then don’t do it. Your whole assumption that getting the bends is only associated with deco diving is untealistic

 

[johndiver999]

Which begs the question, would they have been just as well off getting on 100% 02 at the surface? I've read plenty of stories about folks feeling symptoms, getting on 02 as the boat races back in, and feeling fine by the time they get to the dock.

Don’t know. I came up from an hour long dive in 75 ft that was no deco and I did a safety stop. Got on boat and had weird intense pain in upper back. Tried to stretch and convince myself it was muscular and it was getting worse and felt strange.

Put tank back on and when I hit 35 feet all, 100% discomfort was instantly relieved. Hung out for 5-7 minutes then slowly ascended over 15 -20 minutes and was cured. Went snorkeling and had a cook out an hour later. Really was pretty surprising to me how I got instant relief and had no issues or even tiredness after ward. Anecdotal evidence and proves nothing, right?

 

[boulderjohn]

Where do we draw the line between true "in water recompression" versus surfacing with skipped deco but immediately returning to depth to finish it?

The process for omitted decompression is spelled out in tech courses. You are doing omitted decompression if you deal with it immediately following the omission, are not symptomatic, and are just trying to be safe.

If you have symptoms and return to the water knowing you likely have DCS, the you are doing IWR.

 

[Akimbo]

Someone like @Akimbo can correct me if I'm wrong on the following - but don't commercial divers sometimes surface to 1atm before quickly getting in a chamber for deco?

You are correct. It is called SurDO2 (Surface Decompression using Oxygen). You can read about it in the US Navy Diving Manual, Revision 7A, 2018, Section 9-8.3 Surface Decompression on Oxygen (SurDO2), PDF Page 441. It is the preferred method for air and mixed gas surface supplied diving operations whenever planned decompression is involved.

Most jurisdictions around the world require chambers onboard for military and commercial dive opps when any significant decompression is planned or when working past a certain depth.

 

[Raphus]

It is way more dangerous then some are trying to sell it.
Oxygen toxicity is a possibility of course.
But don't forget the dcs itself..

One examples:
Last year 2 divers surfaced with a little deco, way to fast. After a few minutes they dropped back down and did continue/recompress their deco.
Both died. With gas still in their tanks in only a few meter of water. Dcs hit them both and they were not able to go back to the surface. At the surface they might have a chance by going to a chamber.

It's only a tool for a highly experienced and equipped team. Support divers, full face mask, gases, maybe even a habitat. And only if there is no other option. It is very very dangerous

 

[johndiver999]

It is way more dangerous then some are trying to sell it.
Oxygen toxicity is a possibility of course.
But don't forget the dcs itself..

One examples:
Last year 2 divers surfaced with a little deco, way to fast. After a few minutes they dropped back down and did continue/recompress their deco.
Both died. With gas still in their tanks in only a few meter of water. Dcs hit them both and they were not able to go back to the surface. At the surface they might have a chance by going to a chamber.

It's only a tool for a highly experienced and equipped team. Support divers, full face mask, gases, maybe even a habitat. And only if there is no other option. It is very very dangerous

What is a little deco? Why did they die, are we to assume it was from a little delayed decompression of a minor penalty? Or was there an oxygen toxicity problem?

 

[boulderjohn]

It is way more dangerous then some are trying to sell it.
Oxygen toxicity is a possibility of course.
But don't forget the dcs itself..

One examples:
Last year 2 divers surfaced with a little deco, way to fast. After a few minutes they dropped back down and did continue/recompress their deco.
Both died. With gas still in their tanks in only a few meter of water. Dcs hit them both and they were not able to go back to the surface. At the surface they might have a chance by going to a chamber.

It's only a tool for a highly experienced and equipped team. Support divers, full face mask, gases, maybe even a habitat. And only if there is no other option. It is very very dangerous

Could you give a link to this? I hadn't heard of it before.

 

[OMyMyOHellYes]

I honestly don't know what this sentence means, but I will try to respond to parts of it.

I don't either, but I don't know that the words "circumcisional" and "judgement" EVER go together with out a modifier wedged in there (ie "bad")

 

[berndo]

Last year 2 divers surfaced with a little deco, way to fast. After a few minutes they dropped back down and did continue/recompress their deco.
Both died. With gas still in their tanks in only a few meter of water. Dcs hit them both and they were not able to go back to the surface.

Both died of dcs on a deco stop? Where was this?

 

[Eastwest]

Say I was making a 20 minute deco stop at 10 feet and a swell takes me to the surface , I will recompress by descending to a deeper depth and make a much longer decompression obligation . A horror story like the mid west diver who dies in Key West from a fast ascent and his rescue taking over 3 hours from dock to chamber . A west coast dive shop owner who teaches middle east arm forces and advanced mix gas + CCR did mention using in water recompression at Truk Lagoon a few weeks before as we talked .