On the 29th of January 1917, just a week after seting 23.5 knts on her speed trial, she started on her final dive trial under the command of Godfrey Herbert. There were 80 men aboard her as well as Francis Goodhart, the captain designate of K14.
At 20 feet there was a report of flooding in the bolier room, and despite ballast blown and the 10 ton forward keel droped she sank to the sea bed 50 feet below.. 31 men drowned in flooding aft of the torpedo room.
Herbert and Goodhart both attempted to escape by the conning tower, Goodhart drwoned, but Herbert made it (He also escaped from the submarine D5 when she hit a mine, blowing him clear of the conning tower).
57 hours later they were able to rescue the remainder of the crew.
6 weeks later the sub was raised and renamed K22
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