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[PSUBS-MAILIST] K250 to K400 modification



I am thinking that it would be possible to turn a K250 or any sub
into a semi-ambient for an emergency situation where you needed
to go to 400ft.
Example --- Go down to your 250 ft limit & turn on an ambient system
at that point, this pressurizes the cabin as you progressively descend.
Theoretically you could go another 150ft, down to 400ft.
I guess you'd need a lot of tanks for a K250. Maybe more practical for
Cliffs sub wich is a bit smaller. You would need a dive computer for
decompression calculations, an over pressure valve, a modification of
the life support system wich could be as little as increasing the O2
flow into the cabin. Also the instrumentation would need to take 75psi.
The ambient equalization system could be set up by having a outside
pressure reading & an electronic system that fed air into the hull when
the outside pressure was more than 125psi above the inside.
Just thinking.
Alan