The conning-tower was also secured and clipped from the inside. Was it possible, he wondered, that Cain and his companions were still alive in the apparently intact and air-tight for'ard compartment of the hull? Going aft, the Sub lowered himself cautiously over the riven edge of the hull-plating, lest a sharp projection should penetrate his inflated dress. Then, signing to his fellow-diver to remain, he switched on his submarine electric lamp and crept forward inside the hull.
The first twenty feet or so was greatly encumbered with wreckage, but on passing through the transverse bulkhead, the watertight door of which had been blown inwards, Broadmayne found that there was little damage done to the 'midships section.
As a matter of precaution and to save negotiating the debris-strewn motor-room again, the Sub unclipped and threw open the conning-tower hatch. Then proceeding for'ard he found that the door between the 'midships section and the bow compartment was wide open. It swung freely on its hinges, although the straining the hull had received made it impossible for the usually close-fitting door to close.
In the bow compartment, Broadmayne searched diligently for the bodies of Cain and his companions, but without success. Then he came to the door of the air-lock, by which a man in a diving suit could leave the submarine when the vessel was lying on the bottom. The door was shut. Usually six diving suits and twenty-four life-saving helmets were ranged along the bulkhead. The latter were there, jammed against the curved roof under the deck, but four of the self-contained diving-dresses were absent.
Prising back the locking-gear of the door of the air-lock the Sub entered the compartment. It was, as he expected, empty, but the hinged flap on the outside hull-plating was open.
Captain Cain had made a bid for life and freedom. Whether he had succeeded or had been caught by the explosion before he had got well clear of the ship remains an unsolved problem.
There was no need for further investigation. Broadmayne returned to his companions by means of the conning-tower hatchway. Together they dropped over the side and found the other diver waiting by the distance cords.
In single file, the man with the air-tube leading as the attendants in the boat slowly heaved in his air-tube and lifeline, the three made their way to the shot-rope.
Then came the tedious ascent. To go up quickly and without a pause was not to be thought of. The great risk of being killed by excessive blood-pressure on the brain had to be guarded against. Slowly Broadmayne was hoisted, kept hanging for several minutes and then hoisted a few feet more, until at length he felt himself being grasped under the arms and assisted into the boat. Then his helmet glass removed, he sat and gasped, gratefully inhaling copious draughts of fresh air.
As soon as the other divers were in the boat the anchors were weighed and a course shaped for the Canvey, which was steaming slowly in wide circles round the scene of the wreck.