“No matter about me, then,” muttered Tom.  “If Ella isn’t found right away I don’t believe I care about going back to Gridley.”

Dave’s response was swiftly to knot a noose and let it down over Tom’s shoulders.  The other end of the line he made fast astern.  Dalzell, in the meantime, had swum back again.  Susie Danes lay as still as death in the bottom of the boat.

As Dalzell got back where he had first reached Foss and Susie, he espied the head of Ab Canty some distance away.

“Ab!” called Dan.

“Here!”

“What has become of Ella?”

“Oh, I wish I knew!”

“Was she afloat at all!” demanded Dan, swimming nearer.

“Yes; I kept her up for a couple of minutes, maybe.  Then she got more scared, wound her arms tight around me, and we both sank.  We had a struggle under water.  I freed myself, but when I came to the top I found that my hand was clutching nothing but her empty jersey.  There it is now,” chattered Ab, his teeth, knocking against each other, as he pointed to the garment in question on the top of a distant wave.  Then Ab sank.

For just an instant Dalzell thought Canty had gone below on purpose.  Dan swam closer, to be of assistance.  Then he saw the bubbles of air coming up rapidly.

“Cantys given out—­he’s going to drown!” gasped Midshipman Dan, with horror.

Like a flash Dan dived below, found and clutched at Canty.  The young man returned the grip with interest, but Midshipman Dalzell struggled to the surface with him.  Ab Canty was exhausted, out of his head and altogether past reasoning.  Dan hated to do it, but he had to strike the young man in the forehead.  Canty gave a gasp and ceased to resist.

Dave Darrin, watching, had run the boat up close alongside as soon as the struggling pair appeared above the waves.

“You’ll have to take him in, Davy,” announced Midshipman Dalzell.  “Canty isn’t strong enough to tow behind.  And I’m coming aboard for a fresh look before I dive for Miss Wright.”

“You’re going to stay aboard and manage the boat,” retorted Darrin quietly.  “I’m going in next.”

“Oh, all right, if you want to,” half grumbled Dan.  “But I’m just beginning to get used to it and to like it.”

Dan, however, followed orders and took his seat by tiller and sheet as soon as they had towed Canty safely in the boat.  Tom Foss, lied and holding on at the stern, was beginning to chatter hard, but said he was all right.

A brief instant of consultation the two midshipmen held.  Then Dave Darrin, holding his hands before him, dived hard and deep into the water.

After nearly a minute he came up again, but only to take an observation.  Then he sank, to explore more of the space under water.

For five minutes Darrin continued this, making four dives in all, and sinking twice without diving.

“I can’t give this up, and abandon a girl,” he muttered.  “Dan, I’ve got to take more account of the current, and work gradually downstream.”