little additional work to make the craft ready for the water.
Of course it had to be built near the sea, as it would have been impossible to transport it overland from Shopton. So, before the keel was laid, Mr. Swift rented a large cottage at a secluded place on the New Jersey coast and there, after erecting a large shed, the work on the Advance, as the under-water ship was called, was begun.
It was soon to be launched in a large creek that extended in from the ocean and had plenty of water at high tide. Tom and Mr. Sharp made several trips back and forth from Shopton in their airship, to see that all was safe at home and occasionally to get needed tools and supplies from the shops, for not all the apparatus could be moved from Shopton to the coast.
It was when returning from one of these trips that Tom brought with him the paper containing an account of the wreck of the Boldero and the sinking of the treasure she carried.
Until late that night the three fortune-hunters discussed various matters.
"We'll hurry work on the ship," said Mr. Swift at length. "Tom, I wonder if your friend, Mr. Damon, would care to try how it seems under water? He stood the air trip fairly well."
