Under the terms of an agreement between the Allied powers each side could retain a number of U-boats - a date was fixed by which time the remainder had to be disposed off, in such a way that "put them beyond use" to coin a more modern phrase , scuttling them was what had been agreeded. Selling them was not an option.
Forum: General Discussions

Oxullop , think of the low horizon afforded by the conning tower of a submarine, the mobving sea which would lift the boat up and down , the water which would be thrown up , the similar movement of a potential other ship and a picture should be forming in your mind of some of the practical problems in sighting a ship at long range from a submarione. The standard glass was 7x50 , it afforded the
Forum: Technology and Operations