[Leandros]

Originally Posted by Paul Riley

Well after my recent resurrection of Willie Werner to the ranks,I just did another deep dive test,with a normal compressor (patrol restart),blew twice and the current level is at about 3.9 (I take it that is 390 litres?)

I believe that is a nomer for pressure in the air tanks: 3.9 kg./sq.cm. It is air pressure that drives the water out of the ballast tanks. Less pressure, less power to empty the ballast tanks....No pressure, the water stays in the tanks - no updrift........