"The thing's cut loose from us," said a weary voice.
Hogan laughed shortly: "Everybody out—fifteen minutes for refrishmints."
"Yonder goes that thing!" cried Galton. "Hi can see it!"
Indeed, by peering carefully, Madden could follow the slender outline of the mysterious craft that had towed the Vulcan to this uncanny spot. It had now left the tug and was gliding away to the great misshapen fabric that sprawled on the sea.
Every eye strained to see the outcome of this strange maneuver, when suddenly from the gliding vessel there shot a dazzling light that spread over the bulky mass. Under the beating illumination every detail of the huge vessel stood out garishly. She was immense, with a broad flat prow like a railway ferryboat. She stood high in the water and seemed to have three promenade decks around her.
There was no mast, no rigging, no outside gearing. One squat funnel amidship told that she used steam for some purpose, and out of this funnel black masses of smoke rose slowly in the motionless air. She resembled no craft Madden had ever seen.
Notwithstanding her enormous size, everything about the vessel impressed Madden that she was built for secrecy. She was squat, considering her length and breadth. It was as if her designer were trying to make a craft invisible at sea. As near as Madden could determine in the strange light, she was painted a pale sky-blue. During the day, no doubt, she melted into the sky like a chameleon.
As the smaller craft approached its huge mate, its circle of light contracted until it finally concentrated into a dazzling white spot centered on the prow of the monster. This spot diminished to an intense point, like an electric arc between carbons. A sharp reflection of this point streaked the water between the tug and the mysterious vessels.
Then, under the unbelieving eyes of the crew, the little vessel ran completely into the larger one and was gone. The light vanished instantly. Utter blackness fell over the dazzled eyes of the watchers.
There were gasps, explosive curses of bewilderment, amazement. The little boat had disappeared into the larger. Impossible! Gaskin began his shrill laughter again. Then he gurgled in the darkness as if somebody's fingers had clamped his windpipe.