‘Flood 2.’

‘Open No. 2 Kingston and No. 2 main vent,’ from the ‘Sub.’

A hiss and a spurt of water came from the air manifold, and Hoskins looked over his shoulder as he worked at the spindles.

‘1 and 4 full, sir,’ he reported.

A slight cant forward could now be felt in the boat as the tanks filled and she settled down in the water.

‘How is she, coxswain?’ asked Raymond with his eye still at the periscope.

‘Three degrees by the head, sir.’

‘Right. Flood 3.’

‘Open No. 3 Kingston and No. 3 main vent. Close 1 and 4 vents!’ cried Seagrave.

‘Vents closed, sir,’ came the reports.