In view of the suddenness of the attack, coming from a totally unexpected quarter, it would not have been surprising had the Complex unmasked her guns and thus revealed her identity.

But nothing of the sort happened. Not a man of the concealed crew started to his feet. Discipline—perfect order—prevailed; all on board, with the exception of three victims of the explosion who had already "slipped their cables", remaining alert, awaiting their Captain's orders.

Undoubtedly, it was a complex situation, and one for which no adequate provision had been made.

Cavendish, now that the explosion had taken place, was wondering what he ought to do. Should he order away the panic-party? If he did, they would be obliged, for appearance's sake, to make for the Holton Heath. But was she what she purported to be? Or was she acting in consort with the still unseen submarine?

"If," reasoned the Sub, "if she's a British merchantman, why did the submarine waste a torpedo on us when she had an easy victim of about three times our tonnage?"

[Illustration: THE "PANIC PARTY" (missing from book) Page 184]

Similar thoughts were flashing across the mind of the imperturbable Captain Meredith.

"Order away the panic party, officer of the watch," he shouted per voice-tube. For the present he would ignore the submarine and keep the Holton Heath under observation, he decided.

The latter vessel had swung round slightly, so that her starboard beam was exposed to the sinking Complex. On the bridge of the former, her captain was bellowing incoherent cries. A few hands were preparing to lower the quarter-boats.