"It has, sir," agreed the Lieutenant, as he rubbed his hands to restore the circulation. Even in the electric radiator-heated cabin the temperature was only a few degrees above freezing-point. Mr. Macquare had just returned from a "spell ashore". It was close on sunset, by which time the British officers and crew had to be on board. During the hours of daylight they were allowed to wander freely over a considerable part of the great Russian arsenal, provided they conformed to the regulations laid down by the very democratic commandant. The work of repairing R19 was proceeding apace. Already the diving-rudder had been straightened, and would be replaced the following day unless unforeseen circumstances arose to delay the operation. New tubes for the periscopes had been obtained, and only the fitting of the lenses and minor adjustments had to be made before the submarine was again ready for sea. "The ice is forming rapidly on the Neva," continued the Lieutenant. "It's thick enough to bear a man's weight almost everywhere, except in the Morskoi Canal. They've got the ice-breakers hard at work already." The Morskoi Canal is an artificial channel cut in the comparatively shallow Gulf of Finland, and affords deep-water communication below Cronstadt and the capital. "Let's hope that the Baltic won't be completely frozen over during the next few days," remarked the Lieutenant-Commander. "We're running things pretty fine, but I see no alternative." "Any news of Fordyce, sir?" asked the Lieutenant. "Not yet," was the reply. "In fact I hardly expect to hear until he puts in an appearance. The youngster's not a sort of hare-brained fellow who would look for trouble. Just before he left----" A discreet tap upon the cabin door interrupted the Hon. Derek's remarks. "Come in!" he called out. The door was opened, and the heavy curtain pushed aside, revealing the anxious features of Able-Seaman Cassidy. "Well, Cassidy?" asked the skipper encouragingly. "It's about that dawg, sir," began the sailor. "Mr. Fordyce's dawg." "Has she bitten anyone?" "Sure, no, sir; leastwise not as I knows of. But she's absent without leave, sir." "For how long?" "Can't say, sir. Cook's mate says as 'ow Flirt was in the galley just afore dinner. Me and my mates have looked everywhere." "Have you tried Mr. Fordyce's cabin?" "Sure that Oi have, sir." "Well, she's not here, Cassidy," said the Hon. Derek, giving a perfunctory glance under the settee. "Have another hunt round and then report to me. The dog may have taken it into her head to go ashore for a prowl round." Cassidy saluted and backed out of the cabin to confer with his equally anxious mates on the next course to adopt. The men were grievously concerned about Flirt's disappearance. Never before had the mascot been "absent without leave ".