It took the scout a very short time to make up his mind. He was soon sculling for the mouth of the archway, which, now he knew where to look for it, could be made out as a darker patch in the dusk of the wall. With the utmost care Chippy laid the blunt nose of his craft square in the middle of the archway, and sculled very gently up. The air was thick and close and damp, but a slight current set towards him. He felt it blowing on his face, and knew that there was some opening at the top of this strange passage. He only went a short distance up, then checked his way, and his boat floated quite still on the quiet water of this hidden entrance. Ten minutes passed, and then Chippy heard a voice. 'That's as much as we can shift to-night,' it said; and a second voice said: 'All right; drop a glim on the boat.' At the next moment a strong shaft of light darted downwards into the darkness, and lighted up an empty boat floating within five yards of Chippy. Luckily for the latter, the light came from a dark lantern, whose slide had been turned, and was only a brilliant circle which did not discover the daring scout. Chippy held his breath, and watched. He saw that aloft the light was pouring through an oblong opening; the latter was formed by the raising of one of the two doors of the big trap. He had need to hold his breath; the smallest turn of the lantern would throw the light along the tunnel, and he would spring into full view of the thieves. His position would then be desperate, for escape was out of the question. They had only to drop into their boat and pursue, when his clumsy old broken sweep would prove no match for a pair of oars. So Chippy held himself dead still, and watched with fascinated eyes the strong shaft of light pouring on the boat before him. Presently a strongly corded bale slid into the light, and was lowered by a thin rope. The rope was tossed after it, and the same thing happened with three more bales; and then a pair of legs came into sight, and a man slid swiftly down a heavy rope which dangled above the boat. The man swung himself down, and dropped among the bales. Chippy could not see his face, but the scout's eye saw the man's hand outstretched as he balanced himself with a sailor's skill in the swaying boat, and marked that the little finger was missing. 'I'll stow these, and then give ye a hand wi' the flap,' said the man in the boat. 'It'll never do to let it down wi' a bang, because of our friend outside.' And both of them chuckled.