Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. HMS Venturer (P68) was a Second World War British submarine and the lead boat of the V-Class (officially called the "''U''-Class Long hull 1941-42 program"). She sank U-771 on 11 November 1944 7 nautical miles (13 km) east of Andenes, Norway, off the Lofoten Islands. Her most famous mission, however, was her eleventh patrol out of the British submarine base at Lerwick in the Shetland Islands, under the command of 25-year-old Jimmy Launders, which included the only time in the history of naval warfare that one submarine intentionally sank another while both were submerged.