"c16" was built by vickers at their barrow-in-furness shipyard, laid down on 14 december 1906 and was commissioned on 5 june 1908. the boat collided with south of cromer, norfolk on 14 july 1909 when the steamer "eddystone" drove through the flotilla - colliding with and sinking . "c16" was undamaged and participated in the lord mayor's pageant (17-24 july 1909). "c16" was sunk after being rammed at periscope depth by destroyer off harwich on 16 april 1917. the boat bottomed out at . a mate – samuel anderson – was fired through a torpedo tube to try to escape, but unfortunately drowned. the captain – lieutenant harold boase – tried to flood the boat in an effort to escape through the fore hatch, but the fender jammed the hatch, so the crew was trapped. the escape attempts were recorded by the commanding officer, and were found corked in a bottle found lying near him when the hull was salvaged. all the crew of "c16" died. "c16" was salvaged and recommissioned. "c16" was finally sold on 12 august 1922.