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Suddenly the answer came to him a self-propelled underwater grenade! Horrified, Bud jetted forward, tackling the diver at full speed. A split second too late! The grenade went streaking straight toward Tom Swift! Tom's earphones caught the hiss of the approaching grenade. Instantly his eyes darted to the sonarscope on his wrist. A tiny blip of light was moving on the screen!

He hadn't pushed the cut-off button, yet the ship's engines were suddenly silent. He jabbed at the power switch. Nothing happened. Then the side-jets sputted, and he was slammed sideways into the cot. He snapped on the radio speaker. "Control ... can you hear me? Something's gone wrong out here...." "Nothing's wrong," the captain's voice said in his earphones. "Just sit tight.

When they did not have their handy earphones in service Jack and his right bower had arranged a secret alphabet of signals, consisting of all manner of pokes and nudges, by means of which they were enabled to communicate along professional lines at least.

In addition to their earphones, a loudspeaker had also been thoughtfully set up, apparently to take care of any such curious visitors as ourselves. The disadvantage, soon manifest, was that no plan had been devised to unscramble the reports from the various tanks.

"But a little smart maneuvering can cover up that angle," Tom added. "Try the hydrophones, Arv, and see if you can hear 'em." The chief modelmaker slipped on the earphones and listened intently. For another ten or fifteen minutes they probed about with no sound trace of the "invisible" jetmarine. But presently Arv snapped his fingers to catch Tom's attention. "Got her, skipper!"

It was only a little larger than the one he had used to come here. It dropped down to the surface of the small planetoid only ten meters from the hidden trapdoor that led to the air lock beneath the surface. He could suddenly hear voices in the earphones of his helmet. Lasser? It's me, Fritz. I got your supplies and good news. The air lock trapdoor opened, and a spacesuited figure came out.