1909 to 1921 - C25 - C Class Submarine - 295 tons, 325 dived - 43.6 x 4.1 - 1909 Vickers Shipbuilding, Barrow - 2TT - 13 knots, 8 dived - 06/07/18 machine-gunned and bombed by German seaplanes off Harwich, after being caught on the surface. Commanding Officer and three lookouts on the conning tower killed. One of the bodies blocked the conning towers hatch so she was unable to dive. The First Lieutenant and two ERA's cut off the leg of one of the bodies with a hacksaw to free the hatch. Another two crew members died while trying to close the hatch. The holes in the pressure hull were plugged by clothes and HMS E51 was able to tow C25 back to port - 12/21 sold for breaking.