"Take the bridge, Mr. Chadwick," said Jack. "I'm going below to the radio room."
"See if you can raise the Ventura," he instructed the radio operator, a few moments later.
"Ventura! Ventura!" went the call through the air.
There was no response.
"Try it again," said Jack.
The operator obeyed. Still there was no reply from the Ventura.
"Something wrong," Jack muttered under his breath, "and still I saw no sign of a submarine. Try 'em again, Wilkins."
Again the radio operator sent the call flashing through the air:
"Ventura! Ventura! Ventura!"
The instrument at Wilkins' side began to click.