Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

EXAMPLES FROM THE WEB FOR U BOATS

It was found that U boats could be seen from an aeroplane when they were some depth under the water.

The merchant ships still put to sea—and the U boats pay the penalty.

Fortunately for us, Lieutenant Rose was one of these—a striking contrast to the devils in his country's U boats.