Please don't forget that my sub has many hours of running time, on surface and underwater. We have a pond in the city, it's 70x40 mts (23x13 ft) 5ft deep. Every time we schedule a subs meeting there, I run 4 or 5 laps, walking by the pool, submerged close to the bottom (yes I've scrapped the hull bottom many times) just to test everything. Not a single drop in side the WTC.

The pump is a french Peugeot one, not a FIAT, so you won't have to Fix It Again Tony. As for running the pumt outside the WTC, no room for it (have you ever seen a 1/144 Trumpeter Seawolf?), and frantically no need for it. It drains 800 mA.