There was a drop of thirty feet to the water.

Thirty feet.

Just think what thirty feet is.

About the height of a two-story dwelling house.

"Supposing we get through there," said Harry Girdwood, "we should never be able to swim all the way out to a friendly ship.

"My dear old wet blanket," returned Jack, "I got you into this mess, and I'll get you out of it."

"I hope so."

They watched anxiously for a friendly ship.

At length their vigil was rewarded with success.

A big ship sailed into the bay with the British colours flying at her masthead.