But Bill Henderson, too, was reviving.  Uttering hoarse cries of rage that sounded wonderfully more powerful, now, he fought his three captors to get upon his feet.

There was no help for it.  Captain Jack had to dart over and tap the fellow on the head with the wrench.  Then Bill was quiet long enough to make it possible, for Mr. Farnum to hurry after a pair of the handcuffs that were a part of ship’s stores.  These were snapped over the seaman’s wrists just before he came to.

“Now, we won’t have to hurt him,” muttered Jack, compassionately.  “He’s a maniac, poor chap, or he’d never have done such a thing as try to condemn us all, himself included, to death in the depths by asphyxiation.”

“He’s a maniac, sure enough,” commented Mr. Farnum.  “But how on earth did I ever get trapped into hiring such a fellow as one of the crew?  Confound him, he seemed sane enough until after we came below the surface.”

“And now, sir,” nudged Captain Jack, “I think we’d all of us be thankful enough for a glimpse of the surface—­for a look at the stars—­a breath of real ocean breeze.”

“Good enough,” nodded the boat-builder.  “Travel right to it!”

Though all were weak and trembly from the shock of their late experience, there was strength enough in their combined force to handle the “Pollard” promptly.

While Messrs. Farnum and Pollard sat over the prostrate Henderson, handcuffed on the floor, Hal hurried to the engine room, while Captain Jack climbed up into the conning tower.  Eph Somers stood near the two men and their captive, ready to respond to any call.

But Henderson, now that his maniacal rage had passed, was sobbing quietly.  He seemed spent, exhausted.

It was with a thrill that the young captain of the submarine touched the control for speed ahead from the electric equipment.  Then he looked at his compass, finding that the boat, from a northerly heading, had veered around almost east.  As the boat went ahead, softly, Benson put the course around to north.  Then he called to Hal and Eph to empty the diving tanks by degrees.

“Going up on even keel!” asked young Hastings.

“Surest thing I know,” replied the young captain.

Though there was not much motion, all felt the boat gradually rising.  Then Captain Jack suddenly caught the greater comparative light of the night above the water.  Next, he caught sight of the blessed stars.  But he did not stop the work of Hal and Eph until the boat rode well up out of the water.

“Now, come up and get the manhole open,” called the young skipper.  “Let’s all have a notion again of how it feels to stand in the open air.”

Messrs. Farnum and Pollard had, by this time, completed the captivity of Bill Henderson by wrapping around him and securing many and many a turn of half-inch rope.

As the manhole was opened Captain Jack stepped out, taking the deck wheel.  The others, all except the prisoner, crowed out after him.  Thus they ran along for a mile or two, under the slower electric power.