[PSUBS-MAILIST] Deep sea question

[Vance Bradley]

Alvin carried steel drop weights which were dropped at depth. The new system is like the Mirs and the Pisces before them-- vbts and high pressure pumps. Titanium hulls don't compress at depth so are actually more buoyant at 20,000 feet than at the surface due to increased water density. All that has to be taken into account.
Vance

Sent from my iPhone

> On Apr 14, 2014, at 5:57 PM, <swaters at waters-ks.com> wrote:
> 
> I have a question I have never understood about really deep sea submarines. How do they go up and down?
> Submarines that use compressed air at 3,000 psi like ours could only go so deep before the water pressure is to great for the HP air. What do submarines like Alvin do? This is probably a really stupid question, but I have never understood it.
> Thanks,
> Scott Waters
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