"Look out, Pen!" called Midshipman Dwight, in a low, though sharp voice.

Just too late the warning came.

As Pen leaped to his feet after the last turn, one of his hands struck Darrin forcefully.

Dave swayed, tried to clutch at something, then—

"O-o-o-oh!" rang the first startled chorus.

Then, instantly, on top of it, came the rousing hail:

"Man overboard—astern!"

Farley and Hallam were the first to reach the rail. But Lieutenant Burton was there almost as quickly.

"Haul back!" commanded the lieutenant sternly. "No one go overboard!"

That held the middies in check, for in no place, more than in the Navy, are orders orders.