Don't struggle; don't move; above all, don't try and lift your head, and don't mind if a little water gets in your mouth.

Now!" For a moment Ruthven felt himself under water, and had to make a great effort to restrain himself from struggling to come to the surface.

Then he felt himself lying on his back in the water, supported by Frank.

The motion was not unpleasant as he rose and fell on the waves, although now and then a splash of water came over his face, and made him cough and splutter for breath.

He could see nothing but the blue sky overhead, could feel nothing except that occasionally he received a blow from one or other of Frank's knees, as the latter swam beneath him, with Ruthven's head on his chest.