With a sharp hissing and whistling the air from the auxiliary tanks was driven inboard, and as Lanyard manipulated the wheels operating the forward and aft groups of Kingston valves, to the hissing was added the suck and gurgle of water flooding the main and auxiliary ballast and adjusting tanks.
Immediately the U-boat began to sink. Lanyard delayed only to close the switches which controlled the electric motors. As their drone gained volume he grasped the rifle and swarmed up the companion-ladder, passing through the conning tower to deck with little or nothing to spare—with, in fact, barely time to throw off the two mooring lines and jump into the small boat before water, sweeping hungrily up over deck and bridge, began to cascade through conning tower and torpedo hatchways.
Constrained to cut the painter lest the dory be drawn down with the fast-sinking submarine, he fitted oars to locks and put his back to them, swinging the small boat hastily clear of whirlpools which formed as the waves closed over the spot where the U-boat had rested.
From first to last less than five minutes' activity had been needed for the task of scotching this water-moccasin of the salt seas and putting its keepers at the mercy of the country whose hospitality they had too long abused.
Well content, after a little, Lanyard lay on his oars and contemplated with much interest what the night permitted to be visible: the landing stage, no more than a dark, vague mass in the darkness; the land picked out with but few lights, mainly at windows of the base buildings, painting dim ribbons upon the polished floor of the lagoon.
