They retreated to the further end of the ledge, to which the light of their torches scarcely reached, and carefully hooked the ladder to the jagged rock. Then in perfect silence they descended. The water only came to their knees. Wading through it with scarcely more noise than an otter might have made, they drew gradually nearer to the rock behind which the seals had sheltered. Here they found themselves baulked. The rock was close to the wall, and it was impossible to get a shot at the animals without circumventing it, which appeared to Dick a dangerous movement. The surprising quickness with which the seals had shuffled off their former perch showed that, if a shot failed, they might fling their heavy bodies upon the assailants before they could escape. He was considering what to do, when a movement among the seals forced him to act on the instant. The largest of the creatures heaved itself to the top of the rock, and lay there as if on the watch for the enemy, presenting the side of its head to Dick. He raised his musket, a firelock of ancient type, and fired. The reverberations in the hollow vault were broken in upon by a hoarse roar, and through the cloud of smoke the seal slid over the rock into the water, and came swimming towards the two boys. Dick seized Sam’s musket, preparing to fire again; his first shot had only enraged the animal. But before he could raise the weapon, the seal threw itself out of the water, and he had just time to spring aside and evade its onset. As it passed, its flipper struck the musket from his grasp, and it fell with a splash into the water. Sam, for all his fear of ghosts, was brave enough before a real enemy. He was standing a yard or two in Dick’s rear. As the seal plunged heavily into the sea, Sam brought the hammer down with all his force upon the creature’s head. There was one tremendous convulsion of the water, then the seal’s movements ceased and it sank to the bottom. [Illustration: "AS THE SEAL PLUNGED INTO THE SEA, SAM BROUGHT HIS HAMMER DOWN."] Meanwhile, the other animals, scared by the noise, had flung themselves into the water, and were swimming towards the mouth of the tunnel. "Well done, young Sam!" said Dick. "You did that famously." "So I did, to be sure," replied Sam, "but I couldn’ help it. You shot un, Maister Dick; see his blood." There was a red tinge upon the water. "How are we to get him up?" said Dick. "He’s a monstrous big fellow." "We’ll wait till tide is down and skin him here. Be his body good to eat?" "That I don’t know; we can try. But the skin is the valuable part of him, and having that we may leave the rest."