Read some about the older Subs an thier Dive Deeps
US Boats
http://www.fas.org/man/dod-101/sys/ship/ssn-594.htm
http://www.fas.org/man/dod-101/sys/ship/ssn-637.htm
All the Same , Hy80 Steel and OLDER than the LA.
Official!! Deep is 600 m Then is the Max Deep deeper .
The Tresher crushed at 2700 M !!!... but this isnt the Operating or max usable Deep which is much lower. The Tresher has HY80 Steel to.
Then this seems to BE unreal.... The SAME Steel an a lower Deep??? Not Logical or thinkable.....
http://www.fas.org/man/dod-101/sys/ship/ssn-688.htm
Then the Seawolf have HY100 Steel... The Operating Deep is thinkable one third deeper than these of the LA.
RUSSIAN BOATS
http://www.fas.org/man/dod-101/sys/ship/row/rus/945.htm
http://www.fas.org/man/dod-101/sys/ship/row/rus/685.htm
http://www.fas.org/man/dod-101/sys/ship/row/rus/705.htm
All have Titan Alloy Structures. Look at the Depths
http://www.fas.org/man/dod-101/sys/ship/row/rus/971.htm
The Akula have a possible Titan Double Hull!! . It goes deeper than the written 2100 Feet!!.
Then the Typoon have a Double Hull with five Pressure Hulls of Titan !! Steel.
NOW say this CANT go deeper than 4 or 500 m !!!
Not very logical.......
Then i heared from a Source that our 214 CAN goes to 1000 m . This i cant believe because this Boat is a relatively small Boat against the nuclear Subs but it is much quieter due the fuel cell plant propulsion system.
But it have a silent water pressure Launch System for Weapons , then multiple outboard CM Launcher etc.
I called it the Mini Seawolf :-)
Greetings
Moc