"There is danger of the magazines exploding right aft here," Hal heard someone exclaim in the calmest tones. "Say, men, who is for it? I want six of the boldest and best."

The voice, which was that of a young man, came from an officer standing beside him. At the words a number of dark figures sprang forward from a group occupied in lowering a boat, and Hal promptly pushed his way in amongst them.

"That's the way; and now for the buckets, boys," the officer who had spoken first exclaimed. "Fill 'em up, and follow down below. Quick's the word, for there isn't much time to lose."

Grasping the rope attached to a wooden bucket, one sturdy sailor flung it overboard, and soon filled a couple of others, which stood at his feet, while four more were taken to a sea-cock close at hand. Hal quickly possessed himself of one, and at once hurried below to the magazine.

"Hillo! and who's this?" the officer asked, stepping up to him and lifting a lantern to his face.

"I'm a volunteer from a ship alongside," Hal answered.

"And a Britisher?"

"Yes."

"Good! Put it right there." The lieutenant shook him heartily by the hand.

A moment later the men threw open the magazine, in spite of the terrible risk they ran, and flung the contents of their buckets upon the explosives. Then they raced to the deck again for a fresh supply of water, and did not cease from their arduous labors till all danger of another explosion was at an end.