30 people in a confined space, hard work around the clock and no contact with friends or family - life on one of the most modern submarines in the world is not for the faint of heart.
The documentary accompanies the crew of the German U32 submarine on its journey from the Eckernforde naval base through the difficult-to-navigate Kiel Canal to Plymouth in England.
The tasks of the crew even push the hard-boiled soldiers to their limits, as our submarine documentary shows.