"You have been told, of course, that we always report our whereabouts after dark?"

"Yes, it is common knowledge with the Allies," Dave admitted. "And also that you receive instructions from the home offices of your Admiralty."

There was a crackling sound on the aerials, followed by others, some short, some long.

"A wonderful invention, is it not?" asked von Schellen, with satisfaction.

"Yes, and first developed outside of Germany," Dave bantered, good-humoredly.

"True enough, but we have known how to take the radio and adapt it to all our needs," retorted von Schellen.

"Your operator is now reporting your whereabouts, of course."

"That would seem likely, wouldn't it?" the other demanded.

"And then you will receive information."

"Yes; and sometimes we have even messages for our men from their homes," laughed von Schellen. "More! I have even had tender messages from my sweetheart! And have answered them in kind!"