Submarine "C 12" was under way in the Humber; her main driving motors failed, and before the fault could be remedied or anchors let go, she was carried by the strong ebb-tide against the bows of destroyers which were lying at the Eastern Jetty at Immingham, and badly holed. Most of the crew and the first lieutenant (Lieutenant Sullivan) were below at the time, while the captain (Lieutenant Manley) was on deck. Seeing that the boat was sinking fast, Lieutenant Manley ordered all hands on deck. They hurried up, the first lieutenant remaining below. The water was pouring in over the electric batteries, causing heavy chlorine fumes to be given off. The boat was on the verge of sinking when, the last man being up, Lieutenant Manley went below, closing the conning-tower lid after him. The boat then went to the bottom, with both officers inside her. Finding, however, that nothing could be done owing to the extent of the damage, the chlorine gas, and the weight of water entering, these officers entered the conning-tower, closing the lower door after them. They then flooded the conning-tower and, lifting the upper door, swam to the surface, reporting that nothing could now be done without salvage plant to lift the boat. War produces a lot of incidents of a note-worthy kind, but work in submarines produces similar incidents under peace conditions also, because the Service is always at war with its constant enemy--the sea. The boats have small buoyancy, and a leak is a dangerous thing; they are very vulnerable to the ram, and even in peace manoeuvres before the war we lost 6 boats from collisions either on the surface or diving. During the war we lost 61 boats, of which 7 were blown up without losses in personnel--these being the boats of the Baltic Flotilla. 20 were lost from a cause unknown. In other words, they went on patrol, and nothing more was heard of them. The enemy have no knowledge of their fate, and there were no survivors from them. Their loss was probably due to their striking mines. 5 were sunk by enemy submarines (one of them--"E 20"--in the Sea of Marmora). 3 were sunk while entering the Dardanelles, and 1 by gun-fire in the Marmora. 4 were sunk by mines off our own coasts. 3 were wrecked on neutral coasts, 1 in the Baltic, and 1 on our own coast. 2 were sunk by air bombs. 7 were sunk by collision. 3 were sunk in error by gun or ram by our own side. 1 sank in harbour, 1 sank on trials, 1 was sunk by gun-fire after sinking a German destroyer off the Bight, and "C 3" blew herself up on St George's Day against the Mole at Zeebrugge. The losses were heavy, but were not incurred uselessly. The boats were the outposts of the Fleet, and, however great the losses, they could never have equalled those the bigger ships would have had to endure had they been given the same patrols to perform.