Quote:
Originally Posted by Fidd
The reason I ask is that again working from anecdotal accounts, a loss of vertical control was not that unusual, with u-boats being "blown to the surface". This suggests that in attempting to recover from great depths, the main ballast tanks were blown at least partially, but that reflooding them either not be achieved quickly enough to prevent broaching to the surface, or, that once a rapid upwards movement began, it could not be arrested despite the main ballasts being reflooded at depth.
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True
Whole mechanism workes like these: Let's say that you pumped out 5 tons of water from forward and 5t from aft tanks at 180m depth. Your boat is slowly rising. The more you go up the smaller pressure of water around you. At 90m depth there's 10 t of water less in your tanks - air inside the tanks expands. at 45m there's allready 20 t of water pumped out. The shalower you are the faster you're surfacing. It works in game, except one thing.
the "negative tanks" is placed inside the pressure hull. The other 4 are not. They're not pressure - resist. That means, if you blown your balast at 200m depth you have to keep inside and outside pressure at the same level. If they're full of air it must stay like these till surface. Otherwise if you open valves at let's say 100m the water surrounding will crusch them. It worked like these in real U-Boat. I am not sure about the game