Behind the engine room were the electric motors which propelled the craft when it was submerged. There were two of these, developing between them 1,500 horsepower. The underwater speed of the _S-18_ was rated at eleven knots an hour. In this room was located the master switchboard for the complicated electrical devices on which the life of the submarine depended so much of the time when it was underwater. They continued their tour of inspection, drawing nearer the sound of the steady hammering. In the next compartment they discovered the cause of the noise. A red-haired youth a little older than Tim was banging away industriously with a hammer at the bent end of a bunk which he had lowered from its place on the wall. "What's the matter, Pat?" asked Ford. The red-haired young man looked up quickly. "Hello, Mr. Ford. I've picked out my bunk and I'm doing what I can to get the dents out of this end." "I'm glad it's nothing more serious. For a while I thought someone was trying to take my submarine apart." The young man with the hammer straightened up and looked Tim over with cool, impudent eyes. "You two might as well get acquainted right now," said Ford, "for you're going to see a whole lot of each other in the coming weeks. Tim, I want you to know Pat Reynolds, who next to me will be in actual charge of the operation of the submarine. I consider Pat one of the finest submarine men in the world. He was with Sir Francis Habernicht on his submarine trip under the Arctic ice and it was due solely to Pat's cool-headedness that they came through alive." Tim stuck out his hand and Pat grasped it firmly. There was an instant bond of liking between them. Ford went on to explain Tim's presence. "If it hadn't been for Murphy I might not be here right now," he said. "Tim and his flying companion kept Jack Sladek from getting me in the Cedar river valley. Tim's going to be a mighty valuable member of the expedition for I've decided to take along a small seaplane and he's to do the flying." "I didn't know you were going to take a plane," said Pat. "Neither did I until this morning. Word came to me that Sladek is back in New York and is busy now outfitting a tramp steamer. He's taking a plane and I don't want to feel that he has any advantage which I can not overcome." "But where can we carry an airplane on a submarine?" asked Tim. "We'll have to have special rigging placed on the deck ahead of the gun turret. We'll be running above water all of the way to the island and when we arrive we can unload the plane and after that keep it moored on the beach." "This expedition commences to look like a humdinger," grinned Pat. "I wouldn't miss it for anything." "There will be plenty of excitement if Sladek can do anything about it," conceded Ford, "I've got a great many things to do in New York this afternoon. Pat, you finish the tour of the submarine with Murphy."