"We can work all the better at it there.

Jacques, do you get that sail up out of the boat and throw it over the hatch.

It isn't likely anyone will come out here through the fog; but it's just as well not to run any risk." As soon as all were below, and the sail spread over the opening above, Adolphe produced a dark lantern from the great pocket of his fisherman's cloak, together with two or three candles.

These were lit at the lantern, and the party then set to work.
Two saws had been brought on board, and a piece three feet square was cut out of the top of the hatch, leaving six inches of wood all round.

Great pains were taken not to saw through the tarpaulin cover.
"Now, the next thing to do," Harry said, "is to fix the beams so as to hold the wood in its place again." Four pieces of wood, each three inches long, were screwed against the combing of the hatchway in such a position that when the beams were placed upon them they were exactly level with the top, and supported the piece cut out from the hatchway in its original position.
"That will do rarely," Adolphe said, when it was finished and the hatchway experimentally placed in its position.