"I beg to differ," was the rejoinder. "Unfortunately you are on board, and you must make the best of it, I understand from my friend—shall I say Dr. Ramblethorne—that you are both very inquisitive. Inquisitiveness is a bad trait in ones so young. You see, it has got you into trouble. The doctor has strong reasons for getting me to take care of you for some considerable time, so you will have an opportunity of seeing how we Germans make war. No half-measures, mark you. It is useless to make war with a velvet glove. You English people call us pirates, I believe?"

"It certainly looks like piracy when German submarines sink harmless merchantmen without warning," declared Vernon.

"For my part I have never sent a merchant vessel to the bottom without warning," said Schwalbe. "As a seaman I regret having to sink any ship of commerce. As an officer of the German Navy I have to obey orders unquestionably. Nevertheless I have always given the crews of British ships a chance of escape, and have never sunk any vessel until the men are safely in the boats, unless she attempts to show fight or to run away."

"Would you blame a skipper for trying to save his ship?" asked Ross.

"You do not understand," exclaimed Schwalbe. "We are at war. A blockade has been declared upon the British Islands. If, after full warning, merchantmen persist in taking the risk, it is their look-out, not mine. However, to return to a more personal matter: having been saddled with you, I must endure your presence. You will be well fed, as far as the resources at our command will allow. You will be free to go wherever you wish on board, with the exception of the conning-tower, motor- and torpedo-rooms. I am not ungrateful, for my brother, who had the misfortune to be in the Ariadne, was captured by your fleet. He is being well treated somewhere in England. Hence I give privileges to the son of Admiral Trefusis and the son of Commander Haye so long as they are my compulsory guests. But bear in mind: you will be watched. Should you commit any fault, however slight, you will pay dearly for it. If you are foolish enough to attempt any act of treachery, death will be the penalty. Have I made myself perfectly clear?"

"Yes, sir," replied both lads.

"Very well. Is there anything you would like me to do within the bounds of reason?"

"Could we communicate with our parents?" asked Ross.

"No," replied Schwalbe decisively. "There are strong objections. And, while I am on the subject, should you fall in with the crews of destroyed ships you are strictly forbidden to communicate with them either by word or gesture. That will be a punishable offence of the second degree. Anything more?"

"My friend has had a nasty knock on the head," said Trefusis. "Have you a doctor on board?"