Forty-two vessels were ordered to this design, all to be built by Vickers-Armstrong at either Barrow-in-Furness or at Walker-on-Tyne, but only 22 were completed. Note that seven of these vessels received 'U' names (conversely, four of the U class had received names beginning with 'V').
The V-class submarines were very similar to the preceding U-class (short-hull) boats, of which they constituted a linear development, but had 3/4-inch pressure hull plating instead of 1/2-inch for deeper diving, also a lengthened stern and fining at the bows to reduce noise and improve underwater handling.
They were sometimes referred to as Vampire-class submarines after .[2]
It was one of this class,, that would go down in history as the only submarine to sink another submarine while submerged - that submarine was the German .
The vessels which were ordered are shown below in their programme order (not all completed construction):
The first eight vessels were ordered on 5 December 1941 under that year's programme.
The next eighteen vessels were ordered on 21 May 1942 under that year's programme, but six of these were cancelled in early 1944.
A further six vessels were ordered on 17 November 1942 under the same year's programme, but four of these were cancelled on 23 January 1944.
Finally, a further ten vessels were ordered under the 1943 Programme, but all of these were cancelled on 20 November 1943; eight of these were never given names.