Whats it take to dive at 250 feet?

[Shockwave]

Cant do it on regular dive gear can you?

 

[Atomicus]

With scuba you can dive this much Text

 

[Goosemaster]

Keep in mind that your POS timex will explode, with exception of course

 

[Bootprint]

free dive it

 

[HomeBrewerDude]

Originally posted by: Bootprint

free dive it

holy crap!:
Women
Salt Water
Yasemin Dalkilic
Turkey
120m/394 ft. 2:45 min. July 19th, 2000 Bodrum, Turkey Hal Watts, Rudi de Nardo

 

[myusername]

heliox

 

[joecool]

Originally posted by: Bootprint

free dive it">http://www.divingfree.com/records/records2.htm</a>

tuly amazing. seems almost unhuman to me. maybe molder and scully should investigate.

 

[AndrewR]

Trimix (I think), specialized gear, lots of training and experience.

Read "Shadow Divers", a book that just came out. It's about some wreck divers on the Atlantic coast that found a WWII submarine at 230 ft or so. Three guys died while diving on the boat. The book has some fascinating accounts of deep wreck diving.

Incidentally, you CAN dive that deep on air (they did in the book), but you get a serious case of nitrogen narcosis. I've felt it a couple times (mildly), and the only thing I can compare it to is when I take a strong cold medicine and get a "floating sensation".

 

[Shockwave]

Just wondering, cause at some point I would love to dive the Andrea Doria. That would make for a cool dive.

 

[GasX]

Safe diving at that depth takes a LOT of experience, a lot of discipline and a trimix certification that you can't even start working on unless you have more than a few hundred dives.

Basic gear required above and beyond "basic" gear

A drysuit (if temp @ depth is cold)
doubles tanks on your back
deco tanks under each arm
regulators for each tank
safety reel(s)
wreck reel(s)
lift bags
surface marker bouys
redundant bottom timers
writing tablet/slate

pic

 

[GasX]

Originally posted by: Shockwave
Just wondering, cause at some point I would love to dive the Andrea Doria. That would make for a cool dive.

Sadly, the wreck is all but broken up at this point. Ships aren't designed to lay on their side in salt water and strong currents...

It is also one of the most dangerous dives. The Book "Deep Descent" is the best book I have read on scuba diving and is all about the histrory of diving this wreck and all of the lives she has claimed...

 

[Calin]

The 100 - 120m is the limit for diving with compressed air (O2 and N2). I think they use a lower concentration of O2 in air tanks for such depths.
Anyway, it would be much safer (and much more expensive) to use helium and O2 at low concentration for such feats.

 

[GasX]

Originally posted by: Calin
The 100 - 120m is the limit for diving with compressed air (O2 and N2). I think they use a lower concentration of O2 in air tanks for such depths.
Anyway, it would be much safer (and much more expensive) to use helium and O2 at low concentration for such feats.

The reasoning behind trimix is that the helium takes the place of some of the O2 and some of the N2. You drop the 02 level so you have less chance of getting hit by oxygen toxicity which is deadly, and drop the N2 level to reduce the narcosis which can cause you to do something stupid. The helium has its own risks, but not as significant as either nitrogen or oxygen.

The biggest challenge of diving to 250 feet is decompression. For 20 minutes of bottom time, you will spend 2+ hours decompressing in order to come up safely. There better be something Damn cool to see down there for that kind of time...