[PSUBS-MAILIST] Actual water pressure

[Troy Hambly <embalmer@ameritech.net>]

Hi, I'm relatively a newbie to this site...I've been lurking around for 
the past few months.
I had built and sunk an ambient sub many years back going off of the 
Popular Science plans that used a surplus aircraft wing tank.  Mine was 
sooo surplus that the top rusted off of the bottom during a dive and the 
bottom is still sitting about 40 feet down on  a murky lake bed.

Anyway, I'd like another stab at this project, but this time I'm going 
to do it right and build a 1 atm design.  My questions are, what are the 
actual pressures that will be subjected on a sub at 250 feet, 500 feet, 
1000 feet.  I know these will be somewhat approximate, but these numbers 
will give me an idea of some design goals in the strength and maximum 
depth.  I'm looking more towards the area of a 2 person short duration 
sub and I really don't need super depth capability, but if I can go 
lower without significantly increasing the costs of 
building...everything is open to negotiation at this time.

Troy Hambly