Page:Victory at Sea - William Sowden Sims and Burton J. Hendrick.djvu/146

128 at full speed; the wake suddenly ceased, but a few splotches of oil were seen, and she was steered in the direction of this disturbance. A depth charge was dropped at the spot where the submarine ought to have been, but it evidently did not produce the slightest result. The Christabel rejoined the Danae, and the two went along peacefully for nearly four hours, when suddenly a periscope appeared about two hundred yards away, on the starboard side. Evidently this persistent German had been following the ships all that time, looking for a favourable opportunity to discharge his torpedo. That moment had now arrived; the submarine was at a distance where a carefully aimed shot meant certain destruction; the appearance of the periscope meant that the submarine was making observations in anticipation of delivering this shot. The Christabel started full speed for the wake of the periscope; this periscope itself disappeared under the water like a guilty thing, and a disturbance on the surface showed that the submarine was making frantic efforts to submerge. The destroyer dropped its depth charge, set to explode at seventy feet, its radio meantime sending signals broadcast for assistance. Immediately after the mushroom of water arose from this charge a secondary explosion was heard; this was a horrible and muffled sound coming from the deep, more powerful and more terrible than any that could have been caused by the destroyer's "ash can." An enormous volcano of water and all kinds of debris arose from the sea, half-way between the Christabel and the spot where it had dropped its charge. This secondary explosion shook the Christabel so violently that the officers thought at first that the ship had been seriously damaged, and a couple of men were knocked sprawling on the deck. As soon as the water subsided great masses of heavy black oil began rising to the surface, and completely splintered wood and other wreckage appeared. In a few minutes the sea, for a space many hundred yards in diameter, was covered with dead fish about ten times as many, the officers reported, as could have been killed by the usual depth charge. The Christabel and the ship she was guarding started to rejoin the main convoy, entirely satisfied with the afternoon's work. Indeed, they had good reason to be; a day or two afterward a battered submarine, the U C-56, crept