Сообщение от
G. Williamson "Wolf Pack - The Story of the U-Boat in World War II"
Once at the required depth below the surface, the boat would level off and hydroplanes would be used to keep the boat stable and stop it from rising to the surface. U-boats normally had a slightly negative trim, so that if fully stopped they would slowly sink. In order to stay at the required depth, some forward movement was therefore needed and this, in conjunction with skilled use of the hydroplanes, kept the boat level. Although compressed air could shift water fore and aft between bow and stern trim tanks to adjust the balance of the vessel, the simple expedient of moving unoccupied crew members from one end of the boat to the other was often used instead.
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