Once out of the harbour, ‘123’ lifted gently to the swell, and with her hydroplanes turned out and all hatches closed, with the exception of that from the conning-tower, was cutting through the water like a great porpoise.

By now the crew had settled down to sea routine, and only the captain, navigator, and coxswain were on the conning-tower bridge, and an occasional seaman or stoker up for a breather or smoke-oh.

Boyd, who had been looking aft intently, lowered his binoculars and glanced at the compass.

‘Bearing’s on, sir,’ he reported. ‘Course is fifty-six.’

‘All right. Steer fifty-six. That’ll do, coxswain. Helmsman to the wheel.’

The coxswain was relieved and bustled below, and a young A.B. took the wheel, or rather the electric switch which, by a movement of the finger, altered the direction of the ship’s head.

‘Wonder if we’ll see anything this time,’ continued the skipper. ‘Fritz doesn’t seem to be over-anxious about coming out lately. I never seem to have any luck, but he’ll be a nasty customer to tackle if ever we do run across him. He won’t give in while he’s got a kick left in him.’

‘Gets a bit monotonous,’ admitted Boyd. ‘My brother’s in France. Sometimes I wish I were out there too. They do see something of the scrapping at any rate. What gets on my nerves is this constant being on the alert and never seeing anything. If you were told you were to go out and strafe a Hun one wouldn’t mind. It’s the uncertainty of the business that shakes me.’

‘Now, I can’t allow you to complain of your lot,’ replied Raymond. ‘Here you are in one of the latest inventions of the twentieth century, and even that doesn’t satisfy you. When you have met George Willie in his little sardine tin you won’t be quite so anxious.’

‘Two o’clock,’ he continued, glancing at his watch. ‘We’ll dive at half-past five. Call me at a quarter past.’