look at the movie das boot gibralta dive to aviod aircraft emergancy blow ((not suppose to dive without cpt)) than a short steam south dive again stuck planes blow tanks than just enough for 1 more blast of course this is a movie and under emergancy so 3 emengancy blows is about it which is about right ingame
just the normal surfacing proceedures should be looked into as far as how much air was used --no biggie just some thoughts on this lovely day
