It was manned by four men, and when all the party were on board the negroes began to row toward the island.
At six o'clock the day broke. They were a few miles from the land, which was distinctly visible, with a few trees scattered here and there.
The captain stood up in the boat, and narrowly regarded the sea. At last he gave a sign, and the anchor was lowered.
"Here we are," said the captain. "Put on your divers' caps, gentlemen, and follow me."
The heavy sea garments were quickly put on.
The electric lamps were not needed, because the depth was not great.
Besides, the electric light would attract the sharks, who were creatures they could not afford to despise.
The only arm given to each of the party was a long, sharp knife.
Captain Vindex set the example of springing into the sea, the others following him as soon as they were thoroughly equipped.
The negroes remained in the boat awaiting their return.