"Then what's your plan, Benson?"

"Why, sir, we've got, first of all, to sail as close as we dare to that mast-stump. Then we've got to use a sounding line to find out in which direction the hull of the sunken derelict lies. We must also get an idea of the length of the hull. Then, having gotten our figures, we'll have to glide back a little way, so as to give a right-angle broadside on at the hull of the derelict. Before firing the torpedo we'll first have to go far enough below water so that we'll know we're in fair line with that sunken hull yonder, for we've got to make our one loaded torpedo do the trick."

"You've got the figures down all right," nodded Lieutenant Danvers, thoughtfully. "The risky part is in trying to run over that derelict's sunken hull in order to locate it and make your soundings. Now, you run a big chance of running plumb on to some other stump of a mast. The 'Hastings' may easily get an injury, from the stump of another mast, that may tear a real hole in our plates and send us all to the bottom."

"There's danger to be considered in any submarine game really worth the while," assented Captain Jack Benson, coolly. "Do you feel then, Mr. Danvers, that we should be satisfied to drive back to Dunhaven and content ourselves with wiring the Navy Department news of the derelict and of her present position?"

Lieutenant Danvers thoughtfully gazed at the young submarine commander's face.

"No," he muttered, at last. "I think the best thing for a fellow like you, Jack Benson, will be to wade in and get your revenge! And make it as complete as you can!"

"All right, sir," nodded Jack. "Thank you. And now, we'll see how complete a job we can make of it. Mr. Somers!"

"Aye, aye, sir," answered Eph, from below.

"Are you going to consult with your crew?" whispered Danvers.

"They're not the kind of fellows who need consulting," muttered Captain Jack. "All they want is their orders. Mr. Somers, bring up the sounding line."