"Ha-ha!" muttered watchful Jack, who had followed, keeping behind
another sand ridge. "So, sir!"
The minutes passed, though Jack Benson was so absorbed in watching this
long stranger that the boy had but the vaguest notions of the flight of
time.
The tug had halted, now. A great crane at the bow swung around, and a
submarine mine hung poised in the air. Then, with a rattle of chains
not audible at the distance, the mine was slowly lowered until it
touched on bottom.
While this was going on, the long-legged stranger, wholly absorbed in
his own work, made some observations and some hurried calculations.
Then he pulled the drawing-board toward him, jotting down a point.
Jack Benson, standing stealthily, got a good look, for the first time,
at the top of that drawing board.
"A chart of the bay, of course," muttered Benson, savagely, between his
teeth. "The fellow is marking down the exact position of that mine!"
Still, the submarine boy did nothing to betray his own presence. He
watched and wondered. The thought struck him that this long-legged
one might be an officer of the Army, on observation duty like the
submarine boy himself.
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