An instant later Gray shot up to the surface---alone! "Come aboard," ordered Dave Darrin, but he did not rely entirely on coaxing.

Snatching up a boat-hook he fastened it in Gray's collar and drew that midshipman alongside, where many ready hands stretched out and hauled him aboard.
Two of the rescued young women were now sobbing almost hysterically.
"If you won't let me stay in the water, won't some of the rest of you do something ?" demanded Midshipman Gray hoarsely.
"We're going to," nodded Dave.

"Danby!" "Yes, sir." "Let go the anchor." "Very good, sir." "Follow me, Dan," directed Dave.

The anchor went overboard while the two midshipmen were hustling forward.
"I'm going down first, Danny," explained Dave.

"Follow whenever you may think you need to, but don't be in too big a hurry.