"On der chump!" answered the Dutch boy.
"Give the wheel of the diving engine a turn to the left—to the left, mind."
"Dere she goes."
Instantly there was a perceptible movement upward.
"Now," went on Matt, "lift that other lever on the floor near you—the one I didn't lift, if you can remember."
Carl lifted the lever, and, by chance, the right one. A hiss of compressed air was heard, followed by a splash of water being forced from the ballast tanks. The Pom jumped for the surface like a streak.
"Daylight at the lunettes!" shouted Dick, overjoyed to make sure that Matt really knew what he was about. "All you've got to do to know all about a piece of machinery, Matt," he added, "is just to look at it."
"And use my head," laughed Matt.
"Py shinks," boomed Carl, "you can do more mit a cracked head dan any odder feller can do mit vone dot's all ridght. Yah, so helup me. You know more aboudt machinery in a year as anypody else does in a minid."
"See anything of the Japs, Dick?" inquired Matt, stopping the electric motor.