During the night the old swell had run out. Frank had studied his chart till he believed he knew about where they lay, and he set his course by the compass.
Not ten minutes after getting under way they found they were headed straight for an island. In their vicinity the fog was not heavy, but out beyond the island lay a bank of it.
Immediately on sighting the island, Frank changed the course of the yacht, bringing her almost about. Then he ran out past the island, headed for the fog bank.
All at once there was a strange sound, a roaring swish of water. Not one of them was certain which direction the sound came from.
"Vot dot vos?" exclaimed Hans, in alarm.
"Keep still!" ordered Frank.
The sounds grew louder.
Then, all at once, Hans flung up his hands and shouted:
"Reef your rudder, Vrankie! You vos running a sdeampoat ofer us!"