We have seen that the U-boat sought to disguise herself by putting up a sail when in the vicinity of fishing craft or patrol vessels. The submarine which torpedoed one ship disguised her periscope by a soap box, so that it was not realized till too late that this innocent-looking box was floating _against_ the tide. At the best the submarine was an unhandy craft, and it took her from three to six minutes to make a big alteration of course, inasmuch as she had to dive deeper lest she should break surface or disturb the surface of the water. Again, when running submerged, if she wished to turn 16 points—_e.g._, from north to south—the pressure on her hull made it very difficult. It may definitely be stated that those who went to their doom in U-boats had no pleasant death. When the Q-ship caused the enemy to be holed so that he could not rise and the water poured in, this water, as it moved forward in the submarine, was all the time compressing the air, and those of the crew who had not already committed suicide suffered agonies. Moreover, even if a little of the sea got into the bilges where the batteries were placed there was trouble also. Sea-water in contact with the sulphuric acid generated chlorine, a very deadly gas, which asphyxiated the crew. There is at least one case on record of a U-boat surrendering to a patrol boat in consequence of his crew having become incapacitated by this gas; and on pulling up the floorboards of a British submarine, one has noticed the chlorine smell very distinctly. The dropping by the decoy ship of depth charges sometimes totally destroyed the submarine, but even if this was not accomplished straight away, it had frequently a most salutary effect: for, at the least, it would start some of the U-boat’s rivets, smash all the electric bulbs in the ship, and put her in total darkness. The nasty jar which this and the explosion gave to the submarine’s crew had a great moral effect. A month’s cruise in a submarine in wintry Atlantic weather, hunted and chased most of the way from Heligoland to the Fastnet and back, is calculated to try any human nerves: but to be depth-charged periodically, or surprised and shelled by an innocent-looking tramp or schooner, does not improve the enthusiasm of the men. Frequently it happened that the decoy ship’s depth charges merely put the hydroplanes out of gear so that they jammed badly. The U-boat would then make a crash-dive towards the bottom. At 100 feet matters became serious, at 200 feet they became desperate; and presently, owing to pressure, the hull would start buckling and leaking. Then, by sheer physical strength, the hydroplanes had to be coaxed hard over, and then up would come the U-boat to the surface, revealing herself, and an easy prey for the Q-ship’s guns, who would finish her off in a few fierce minutes. Life in a U-boat was no picnic, but death was the worst form of torture, and such as could be conveyed