K-Class submarine was originally built as K13 but, living up to the
reputation of her unlucky number, she sank during her last day of trials in
January 1917 taking 31 men with her. Two months later she was
salvaged, rebuilt and rechristened K22.
year later K22, now part of the 13th Flotilla, was carrying out night
exercises off the Firth of Forth together with 5 battle cruisers, 3
battleships, many light cruisers and destroyers, and 9 other K Class boats,
when K14's helm stuck fast and she collided with K22. Both boats were
severely damaged. Battle cruiser HMS Inflexible then added to the pile
up by crashing heavily into K22's starboard side. Although badly
injured K22 did survive. That same night K4 and K17 were accidentally sunk
and 4 other K Class subs were also damaged! Consequently the K boats
were retired at the end of WW1. K22 was finally scrapped in 1926.