HMS Upholder (P37) was a Royal Navy U-class submarine built by Vickers-Armstrongs at Barrow-in-Furness. She was laid down on 30 October 1939, launched on 8 July 1940 by Mrs. Doris Thompson, wife of a director of the builders. The submarine was commissioned on 31 October 1940. She was one of four U-class submarines which had two external torpedo tubes at the bows in addition to the 4 internal ones fitted to all boats.
They were excluded from the others because they interfered with depth-keeping at periscope depth.
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Foto: Wikimedia Commons — Royal Navy official photographer, Unknown authorUnknown author, Russell J E (Lt), Royal Navy official photographer (proste licence / javna domena)
