"Destroyer broad on the starboard beam, sir," reported a signalman.

The Hon. Derek, standing on the platform in the wake of the conning-tower, was quick to take in the situation. With a thirty-knot destroyer bearing down at top speed delay would be fatal.

"Diving-stations!" he roared. "Look alive, men!"

Down the sole available hatchway the crew poured, the Lieutenant-Commander, Macquare, Fordyce, and the Russian officer standing by until the last of the "lower-deck ratings" had left the deck. To dive was R19's only chance if she were to escape the attentions of the destroyer. Badly trimmed, it was a difficult matter to speculate as to how the submarine would behave—whether she would dive too steeply and ram the mud or roll completely over.

The destroyer had evidently sighted the submarine, for she had altered course and was bearing straight down towards her. As the Hon. Derek leapt below and closed the water-tight lid of the hatchway the approaching craft was less than two miles off.

With the water pouring into her ballast-tanks, and her motors running full speed ahead, R19 plunged rather than glided beneath the waves. Never before had the indicator pointed to such an excessive dip. The lighting dynamo short-circuited, plunging the interior of the vessel into profound darkness, while various articles of gear, breaking loose, careered noisily across the confined space.

Clutching the hand-rail of one of the ladders, Fordyce felt his feet slip from under him. There he hung, his weight supported solely by his hands, awaiting what fate had in store for him.

He was surprised at his own calmness. He found himself reasoning that, after all, one cannot expect to have things all one's own way. Whatever happened, R19 had had more than an ordinary run of good luck, and, should she be "knocked out", there was some satisfaction in the knowledge that she had already acquitted herself in a manner worthy of the traditions of the Royal Navy.

Above the turmoil of inanimate objects on board—for amongst the crew strict silence and discipline were maintained—could be heard the rapid threshing of the destroyer's propellers as the long, lean craft passed almost directly above the diving submarine. Had the destroyer made use of depth charges, nothing could have saved R19 from swift destruction. Why she did not was a mystery to every man of the submarine's complement.

Suddenly, to the accompaniment of a disconcerting, rasping clamour, R19 jerked violently until she hung on an even keel. For some seconds she remained thus; then, rolling excessively from side to side, she bobbed up to the surface in spite of the weight of water in the ballast-tanks and the action of the depressed diving-rudders.