i always thought the uboats had a slightly positive
bouyancy submerged.
"Quick Diving Tank: When filled (in conjunction with the main ballast tanks)
- changes buoyancy from very slightly positive to very negative
in order to enable the boat to dive quickly as soon as the boat is headed down
it is emptied to bring the boat to very slightly positive buoyancy"
so all you would have to do is reduce submerged displacement a little bit, i set it to 716 (surfaced
is 629) and got a slightly positive bouyancy when not moving.
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