“Carry on, sir,” said the steersman, and Hornblower recommenced pushing with his feet against the wall, the roaring he had heard before somewhat muffled by the tarpaulin. A trickle of water volleyed loudly on the tarpaulin, and then another, and he suddenly understood what the roaring was.

“Here it comes,” said the steersman under the tarpaulin.

An underground spring here broke through the roof of the tunnel and tumbled roaring into the canal. The water fell down on them in deafening cataracts. It thundered upon the roofs of the cabins, quite drowning the cries of the women within. The weight of its impact pressed the tarpaulin upon him. Then the torrent eased; fell away to trickles, and then they were past it.

“Only one more o’ those,” said the steersman in the stuffy darkness beside him. “It’s better arter a dry summer.”

“Are you wet, Horatio?” asked Maria’s voice.

“No, dear,” said Hornblower, the simple negative having the desired cushioning effect and smothering further expostulation.

Actually his feet were wet, but after eleven years at sea that was not a new experience; he was much more concerned with the weariness of his legs. It seemed an age before the next trickling of water and the steersman’s “Here it comes” heralded the next deluge. They crawled on beyond it, and the steersman, with a grunt of relief, dragged the tarpaulin from off them. And with its removal Hornblower, twisting his neck, suddenly saw something far ahead. His eyes were by now accustomed to the darkness, and in that massive darkness, incredibly far away, there was something to be seen, a minute something, the size apparently of a grain of sand. It was the farther mouth of the tunnel. He worked away with his legs with renewed vitality. The tunnel opening grew in size, from a grain of sand to a pea; it assumed the crescentic shape to be expected of it; it grew larger still, and with its growth the light increased in the tunnel by infinitesimal gradations, until Hornblower could see the dark surface of the water, the irregularities of the tunnel roof. Now the tunnel was bricklined again, and progress was easier—and seemed easier still.