Perkins had no hesitation in giving all the available steam to his engines. By then, the pinnace having been the better part of an hour on her journey, there was a fine head of steam, the gauge showing a pressure which promised something approaching full power. It was not to be wondered at, therefore, that the whole pinnace vibrated. The engine roared. The propeller behind even threw white foam into the after portion of the vessel. And so, for perhaps five minutes, they continued plunging into darkness, each man of the crew straining his eyes to detect something. "Stop her! Let's listen again. Wait though--give another shout," directed Dicky, and at the command once more a hoarse growl was sent across the heaving water. "Nothing, sir--not a sound," cried Hawkins, when they had listened a full two minutes. "Whoever it was who answered us before is drowned." "No--I heard something. Silence!" called Dicky. "There! Hear it, any of you men?" "Yes, sir. There it is again," cried Hurst, now filled with eagerness. "Listen, sir--there again! Well, I'm blistered!" It was one of the seaman's choicest expressions, reserved for moments of unusual excitement. He let his still-smouldering pipe drop into a pocket and scratched his head with one rugged forefinger. And no wonder that he was puzzled. A moment before he and Hawkins, and Dicky Hamshaw and the remaining members of his crew would one and all have declared that they heard a shout come from a point almost directly ahead. They felt sure of the fact, could have made an oath upon it. And now it came from aloft, from the sky in fact. "I'm blistered!" repeated Hurst, stupefied at such a strange occurrence. "Must be a sort of echo, sir." "Hardly likely. Why, there it comes again, and from the sea this time without doubt. Dead ahead, too. Put her at it, Perkins." Once more the process of giving steam to the engine was repeated, and presently the pinnace was tearing along through the water. Then of a sudden her onward progress was arrested. She struck some object heavily, canted to one side till the water poured in over the gunwale, and righted all in a moment. There was a tearing, grating noise for'ard, followed almost instantly by the hiss of water meeting something intensely hot, and by dense clouds of vapour. "Holed, sir!" shouted Perkins. "There's water pouring in and flooding the furnace. I'm up to my knees in it already." "Stand by there! Get hold of that light, Seaton, and let's see what's the damage. Stand by there, men. This looks like a bad business."