Slowly forging ahead, the submarine passed toward the stern of the Wanderer, shutting the strange figure out of sight.

“Turn around the stern again, Jimmie,” requested Ned. “Go easy on the engines, and we’ll have a look from a new angle. This is getting rather spooky, I must say. I want to examine into it!”

Again the false “U-13” rounded the stern of the wreck. Slowly the craft nosed along the port side to a point abreast the mizzen chains. Directly at a signal from the pilot, Harry shut off power altogether.

The strange magnetism that seems to exist in all objects at sea slowly drew the submarine toward the ship. Its drift had been sufficient to bring the vessel to a point abreast the main rigging before it stopped.

By this time the craft had approached close to the wreck. A very slight jar told the boys that their vessel had touched the other. Eagerly all watched from the portholes, now but a short space above the level of the rail across which they looked. Directly all was still. At this depth, no movement of water was discernible.

Feeling awed by the strangeness of the situation, the boys refrained from speech. They watched for the reappearance of the strange figure.

Soon Jimmie hissed a warning. He reached out a hand to turn the switch controlling the lights. The boat lay in utter darkness.

A figure stepped out of the Wanderer’s companionway.

It appeared to be that of a person of medium build. The boys could now see that it was clothed in what seemed to be a diver’s suit. The helmet, however, was not connected to any air pipe. Neither was there a line leading upward to indicate the presence of assistance. A hump on the shoulders, giving the impression of a knapsack, afforded much wonderment and increased the mysterious look of the newcomer.

“Sh-h-h!” warned Ned in a sibilant hiss, as the figure came directly toward their position. “Keep quiet!” he whispered.