Hello Richard Aiken,
 
I can neither confirm or deny anything classified about submarine operations. However, on the Alpha class the hulls are constructed with, IIRC, titanium while most of the rest of the worlds submarines are not.
 
Tom R

From: "Richard Aiken" <xxxxxx@gmail.com>
To: "TML" <xxxxxx@simplelists.com>
Sent: Saturday, February 20, 2016 9:58:54 PM
Subject: Re: Off-topic - tracking enemy vessels, was Re: [TML] Instant city

On Sat, Feb 20, 2016 at 11:56 PM, <tmr0195@comcast.net> wrote:
The USN developed the Deep Sea Rescue Vessel (DSRV) to get the crew off.


Wikipedia states: "The Deep Submergence Rescue Vehicle (DSRV) is designed to rescue 24 people at a time at depths of up to 600 m (2000 ft). Their maximum operating depth is 1500 m (5000 ft)."

From what I can find with a casual google search, the presumed crush depth for modern American subs is (again according to Wikipedia) officially "in excess of 800 feet" but "probably actually twice that." Which would be about 1,600 feet, so it looks like the DSRV can handle whatever may be needful.

Except . . . 

I found a Federation of American Scientists paper which mentioned that the Soviet Alfa class had an estimated crush depth of *4000* feet. Since the Alfas were built with 1970s-era *Soviet* tech . . . one can not help but wonder how accurate that ~1,600 feet really might be, for the newest American subs. 

-- 
Richard Aiken

"Never insult anyone by accident."  Robert A. Heinlein
"I studied the Koran a great deal. I came away from that study with the conviction there have been few religions in the world as deadly to men as Muhammed." Alexis de Tocqueville (1843)
"We know a little about a lot of things; just enough to make us dangerous." Dean Winchester
"It has been my experience that a gun doesn't care who pulls its trigger." Newton Knight (as portrayed by Matthew McConaughey), to a scoffing Confederate tax collector facing the weapons held by Knight's young children and wife.
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