‘Well, young feller,’ he said, lowering his glasses, ‘seen anything?’

‘Not so as you’d notice it,’ replied Boyd. ‘That light only showed up for five minutes or so. I got some sights by the way, as the land’s too far off for decent bearings.’

‘What you’ll suffer from, my lad,’ said Raymond with a grin, ‘is sextantitis if you carry on as you’re doing now. It’s a very common complaint among R.N.R. Lieutenants, and comes from the constant habit of taking sights. The patient rises at one in the morning and tries to find his latitude with a hambone and a piece of string.’

‘Better to be sure than sorry, anyway,’ answered Boyd.

‘Well, you brought it on yourself. If you only knew what an effort it costs me to be funny at this hour in the morning you wouldn’t ask for it. I tell you it completely defeats me. When we get back I shall have to take a course of something, or drink unpleasant mixtures out of green bottles.’

‘If it’s whisky you mean I can quite believe you,’ returned Boyd, with his legs down the hatch. ‘Well, so she goes. Course fifty-six. Fine weather and no fish.’

‘Give Seagrave a shake when you get below,’ the skipper called after him. ‘Tell him I’m going to dive in ten minutes.’

‘Achchha, Sahib,’ and Boyd vanished below.

Raymond sat down and lit a pipe, keeping a careful look-out over the oily swell of smooth water. Presently he pressed the telegraph switches and the engines stopped.

‘Diving stations!’ he ordered. ‘Shut off for diving! Lower deck control!’