Modern subs have recirculation pumps akin to air conditioning in say, big stores that go all the time, and have filters to keep pollutants, etc out of the seamen"s breathing spaces, a smart and safety-oriented idea. On atomic and modern Diesel subs these recirculation pumps- also akin to those on airliners, run all the time, at least when the vessel is submerged.
pressurised water is filled in the outer cell. and air is removed.
In a pressurised nuclear reactor the temperature is very high, which cn be accepted as a point for this.
As aeroplanes fly high in the atmosphere, where the air is thin, the inside has to be pressurised to allow the passengers and crew to breath.
They take it with them, in pressurised tanks.
no
because it has been pressurised in a similar way (outcome) to how a commercial airplane is pressurised for passengers to fly at altitude.
no your gonna die
Generally, yes
yes
Keg beer is a term for beer which is served from a pressurised keg. Watney's (UK) started with an experimental pressurised beer Red Barrel which was served in a pressurised Keg rather than the traditional Cask (barrel) in 1936. The use expanded rapidly circa 1960
hydraulic is liquid based, pneumatic is air.
You drag the word "submarine" itself onto the submarine. Then you wait for it to sink.