There came across the water the dull beat of a screw and a red light showed faintly through the dusk.  It was the Bairnsdale boat hurrying down to her night’s rest; and the sight galvanized the weary castaways into fresh efforts.  But the steamer passed them half a mile away, deaf to their shouts. Her gleaming lights fell across them as in mockery before she throbbed away towards the Entrance.