We may need her.

There's lots of shoal water in that Upper Inlet." "Right yer are, my boy; there's nothin' like bein' forehanded," remarked the captain as Merritt bent over the flywheel and Rob threw in the spark and turned on the gasoline.

After a few revolutions an explosion resulted and the Flying Fish was off on the mission which might mean so much or so little to the anxious hearts on board her.
"Do you know the channel," asked Merritt as Rob with his eyes glued on the coast sent the Flying Fish through the waves, or rather wavelets, for the sea was almost like a sheet of glass.
"I've been up here once or twice after duck," rejoined Rob, "but it's a tricky sort of a place to get through.

However, I guess we'll make it." As they drew nearer the shores the boys made out an opening which Rob said was the Upper Inlet channel.
"Say, Tubby, get out the lead line and let's see how much water we have," directed Rob as the color of the ocean began to change from dark blue to a sort of greenish tinge, lightening in spots, where the shoals were near to the surface, to a sandy yellow.
The stout lad took a position in the bow and swinging the lead about his head cast it suddenly ahead of the Flying Fish's bow.
"Slow down," ordered Rob, and Merritt cut down the motor to not more than two hundred revolutions a minute.
The lead line, tagged with different colored bits of flannel at each fathom length, sang through the stout lad's fingers.
"By-a-quarter-three," he called out the next instant.
This meant that three fathoms and a quarter or eighteen feet three inches of water was under the keel of the little craft.
"Nough fer a man-uv-war," grinned old Captain Hodgins.
Slowly the Flying Fish forged ahead till right under her bow lay a patch of the yellow water.
"By-a-half-two," came a sharp hail from the fat youth, who had once more heaved the lead.
"Cut her down some more," sharply ordered Rob, without turning his head, "we draw only three feet so I guess we'll do nicely for a while." "Great hop-toads, there's regular shark's teeth ahead," commented Captain Hudgins, pointing to the still shallower water indicated by the lightening tint of the channel.
"By-one-by-a-quarter-one!" came sharply from Tubby, as the Flying Fish seemed hardly to crawl along the water.
"By-a-half!" came an instant later, meaning that only three feet of water lay right ahead.
"Stop her," roared out Rob.
But he was too late.

Instantly, almost as Merritt's hand had flown to the lever, the nose of the Flying Fish poked into the sandbank and her motor with a gentle sigh came to a stop.
"Hard a-ground!" roared the captain, "too bad and with a fallin' tide, too." "Full speed astern," came the next order.
The propeller churned up the water aft into a white turmoil.