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.
A few steps carried the stranger to the rail. The boys saw him give a start of amazement as he prepared to go over the side of the ship. Clearly the strange diver was surprised to see the craft in that position. He stepped back a pace, then came gingerly forward.
Evidently the man was astonished to observe the “U-13”. He climbed slowly into the main shrouds. From that position he surveyed the craft more completely. Again he returned to the deck.
During this examination the lads had remained quietly at their posts, not caring to make their presence known until they were sure of the identity of the other. They still remained with their faces at the portholes, where they observed, so far as possible, every move of the stranger.
Directly they observed the diver pick up the burden he had brought from the cabin. He hastened to the rail of the wreck. In a moment he had clambered overboard, letting himself down by means of a line secured to a belaying pin at the mainmast.
“That’s funny!” observed Ned, as the other disappeared from view. “What do you suppose made him scuttle out of sight so hurriedly?”