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 themselves through the clear green water.

Once Madden looked at the dock. Hogan on the rim of the red flaring wall was flinging out all kinds of despairing gestures.

By this time Caradoc was in hailing distance.

“Did you say sharks?” he called out in a dull voice.

“Yes, sharks!”

“Where a way?”

“Don't know!”

At that moment a trickling thrill went through the American. A long dark motionless shadow lay in the water straight in front of him. He stopped swimming suddenly.

“Stop, Greer! Straight ahead!” he warned in a low tone, easing himself carefully up on his buoy for a better look.

By this time the swimmers were nearly together and all three stared ahead with painful intentness.

“That dark thing?” inquired Greer in an undertone,

“Yes, we ought to have a knife apiece.”

“I never saw a shark lying still,” panted Caradoc straining his eyes.