"That's all for me!" I yelled, getting to my feet. "The secret's out--" "Get down, Legion," Foster shouted. The engines were a blanketing roar now. "What for? They--" Two long lines of fire traced themselves across the sky, curving down-- I hit the dirt behind the stone in the same instant the rockets struck. The shock wave slammed at the earth like a monster thunderclap, and I saw the tunnel mouth collapse. I twisted, saw the red interior of the jet tail-pipe as the fighter hurtled past, rolling into a climbing turn. "They're crazy," I yelled. "Firing on--" A second barrage blasted across my indignation. I hugged the muck and waited while nine salvoes shook the earth. Then the rumble died, reluctantly. The air reeked of high explosives. "We'd have been dead now if we'd tried the tunnel," I gasped, spitting dirt. "It caved at the first rocket. And if the ship was what you thought, Foster, they've destroyed something--" The sentence died unnoticed. The dust was settling and through it the shape of the ship reared up, unchanged except that the square of light was gone. As I watched, the door opened again and the ladder ran out once more, invitingly. "They'll try next time with atomics," I said. "That may be too much for the ship's defenses--and it will sure as hell be too much for us--" "Listen," Foster cut in. A deeper rumble was building in the distance. "To the ship!" Foster called. He was up and running, and I hesitated just long enough to think about trying for the highway and being caught in the open--and then I was running, too. Ahead, Foster stumbled crossing the ground that had been ripped up by the rocket bursts, made it to the ladder, and went up it fast. The growl of the approaching bombers grew, a snarl of deadly hatred. I leaped a still-smoking stone fragment, took the ladder in two jumps, plunged into the yellow-lit interior. Behind me, the door smacked shut. * * * * * I was standing in a luxuriously fitted circular room. There was a pedestal in the center of the floor, from which a polished bar projected. The bones of a man lay beside it. While I stared, Foster sprang forward, seized the bar, and pulled. It slid back easily. The lights flickered, and I had a moment of vertigo. Nothing else happened. "Try it the other way," I yelled. "The bombs will fall any second--" I went for it, hand outstretched. Foster thrust in front of me. "Look!" I stared at the glowing panel he was pointing to--a duplicate of the one in the underground chamber. It showed a curved white line, with a red point ascending from it. "We're clear," Foster said. "We've made a successful take-off." "But we can't be moving--there's no acceleration. There must be sound-proofing--that's why we can't hear the noise of the bombers." "No sound-proofing would help if we were at ground zero," Foster said. "This ship is the product of an advanced science. We've left the bombers far behind."