The only way I can think of, is placing the engine start sound at the end of the "surface the Uboat" sound. When the uboat surfaces, the diesel engines are started in 99% of the ocasions, so the boat has full propulsion power in case it is needed. The main difficulty will be synchronizing this sound with the moment (which will possibly linked to speed?) the diesels from flakmonkey start moving. But it sure can be done. Good idea
