He tried to shift his position a little, to bring other muscles into play and other areas of himself into contact with the platform, but he learned fast enough that it had to be done with tact and timing, so as not to disturb the smooth rhythm of the propulsion of the boat—the steersman beside him grunted a brief protest as Hornblower missed a thrust with his right leg and the boat baulked a little.

“Keep ‘er goin’, sir,” he repeated.

So they went on through the darkness, in the strangest sort of mesmeric nightmare, suspended in utter blackness, utterly silent, for their speed was not sufficient to raise a ripple round the Queen Charlotte’s bows. Hornblower went on thrusting with his feet, urging his aching legs into further efforts; he could tell by the sensations conveyed through the soles of his shoes that the tunnel was no longer bricklined—his feet pressed against naked rock, rough and irregular as the tunnellers’ picks and gunpowder had left it. That made his present employment more difficult.

He became aware of a slight noise in the distance—a low muttering sound, at first so feeble that when he first took note of it he realized that he had been hearing it already for some time. It gradually increased in volume as the boat crept along, until it was a loud roaring; he had no idea what it could be, but as the steersman beside him seemed unconcerned he decided not to ask about it.

“Easy a minute, sir,” said the steersman, and Hornblower, wondering, rested his aching legs, while the steersman, still recumbent, fumbled and tugged beside him. Next moment he had dragged a tarpaulin completely over both of them, except for their feet protruding from under the edges. It was no darker under the tarpaulin than outside it, but it was considerably stuffier.