You are suffering the Crash Dive Blues.
Let me start by saying that the interrupted crash dive behaviour is a evident in a vanilla install of SHIII 1.4b, this ‘feature’ is brought to the fore by the NYGM U-Boat Mod.
If you order a crash dive and before the u-boat reaches the crash dive depth (normally about 70 metres) you order the u-boat to another depth (higher or lower) then what happens is that the u-boat sits down by the stern at an angle of about 10 degrees! The only way to get the u-boat back onto an even keel is then to order another crash dive and of course let it complete.
Due to the abundance of positive buoyancy that allows the U-Boat to hover like a Humming Bird this ‘feature’ was not seen by the player. It would have however made the u-boat sink or sink more severely when the stern of the u-boat was flooding but this is something that the player would have expected and hard to tell the difference between flooding occurrences.
So if you order a crash dive ensure that you let the u-boat go the full distance, you can however change speed & direction without issue.
1. You can change speed after ordering a crash dive without incuring the Crash Dive Blues
2. You can change direction after ordering a crash dive without incuring the Crash Dive Blues
For example, if I order a crash dive and as the u-boat reaches a depth of 15 metres then order silent running and a course change of 180 degrees, as long as I allow the u-boat to level out at the specified crash dive depth, then I will not expereince the Crash Dive Blues.
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