And now we saw in the sky the third of those sword-like beams. It had probably been visible there for some time but we had not noticed it.

"That's Venus," I murmured.

It seemed so. A blurred star, red in this atmosphere, was close above the horizon. The light-beam stood out from it, sweeping up to the zenith.

The gravity station here was about to make contact with the Venus beam. We heard a m.u.f.fled siren, a signal echoing from the subterranean control rooms. The current went into all these wires and towers and twenty-foot ground discs. The hissing and throbbing hum of it was audible. The discs and towers were glowing; red at first, then violet.

Then that milky, opalescent white. The overhead wire-aerials were snapping with a myriad of tiny jumping sparks.

I saw now that the top of each tower was a grid of radiant wires, a six-foot circular projector with a mirror reflector close beneath it and a series of prisms and lenses just above. It all glowed opalescent in a moment, a dazzling glare.

Then the tower tops were swinging. The lights from them had reached the intensity of an upflung beam, and the projectors were swinging to focus the beam inward. The focal point seemed about a thousand feet overhead. All the beams merged there; and guided by the towers directly underneath, a single shaft was standing into the sky.

The entire cauldron depression was now a blinding ma.s.s of opalescent light. We could see nothing but the milk-white inferno of glare. It painted the rocks up here on the rim so that we shrank back, shaded our eyes and gazed into the sky. And from the cauldron, the hum and the hiss of the current, the snapping of sparks, were all lost in a wild electrical screaming turmoil.

Overhead, we saw the Wandl beam from Venus.

Apparently this control station had two functions: the control of the planet's movements, its axial rotation and its...o...b..tal flight, and its ability to apply gravitational force to other celestial bodies.

Wandl was controlling her own movements by applying gravity force, attraction and repulsion, to all the celestial starfield; and doubtless also by applying the repulsive beam tangentially against the ether like rocket streams. In this respect, I realized, the planet was probably operated not unlike one of our familiar s.p.a.ceships. In effect, it was itself a gigantic globular vehicle. Later I learned that it was thought that Wandl's atmosphere could be highly electronized at will, with a resulting aberration of the natural light-ray reflected from her into s.p.a.ce. This could have caused the blurring of the image of Wandl when viewed telescopically from other worlds.

Again, for a moment of the contact, there was that bursting light in the sky.

The contact with the Venus beam lasted a minute or two. Snap and I, on the cauldron rim, were engulfed in the blaze of reflected light and the wild scream of sound. Then presently the turmoil subsided. The contact in the sky was broken. The tow-rope of Venus jerked itself away. But on the next Venus rotation it would be attacked again.

Another few minutes pa.s.sed. The little circular depression beneath us was dim and silent as we had first seen it. Figures were moving within the dwelling structure. From several of the underground entrances figures came up, the ten-foot insect-like shapes of workers. Three or four of the brains came bouncing up, moving along the ground catwalk with little leaps. All the figures entered the distant main dwelling house. The contact was over.

"Probably hardly anyone left down below," Snap whispered. "Now's our chance."

"If we can get into that opening without being seen," I said.

"Shadows, down the rocks to the left. d.a.m.nation, Gregg, we can make it in one calculated leap."

"I'll try it first. I'll get in and wait for you."

"Right."

We each had a gravity cylinder at our belt and a ray-gun in our hand.

The slope of the depression was dim here, merely starlit; it was a steep, broken and fairly shadowed descent, fifty feet to the little dome-like kiosk which marked the nearest subterranean entrance. I went down it with a swoop, landed in a heap beside the kiosk and ducked into it. Instinct made me fear a guard, but reason told me none would be here; there was only the danger of encountering someone coming up.

I was at the top of a winding, descending pa.s.sage, a step-terraced floor; there were occasional lights in the ceiling. In a moment Snap joined me. "Got here! I wonder how far down it goes?"

I gripped him. "Snap, no matter what happens, do it with a rush. Keep with me. And if I shout to get out...."

"We go out with a rush!"

"Yes. Back to the girls. Use your ray-gun and the gravity projector in getting back to them and get away without me, if I fall."

"Same for you, Gregg."

We went down the deserted pa.s.sage. We had had experience in movement on Wandl now; we handled ourselves more deftly. We went down several hundred feet. The pa.s.sage branched, but there always seemed a main tunnel.

It was all deserted. There were distant, dimly-lighted, silent rooms.

Were these factories of the strange forms of electronic gravity currents Wandl used? Some were in operation. A hum issued from them.

Workers moved about.

We stopped to consult. The girls, and Molo himself, had described what we would find: a main route leading to the control room where the delicate mechanisms which operated all this were centralized, the nerve center of Wandl. It seemed that we were following that main route.

A worker came with a swimming leap past us. We dropped into a hollowed shadow at a tunnel intersection, and he went swooping by.

"Lord, Snap," I muttered, "that was too close for comfort."

Again we advanced. The tunnel turned sharply. Down a short slope, a glowing room was disclosed, with two or three workmen moving within it.

The main control room! We could not doubt it. Molo, in his enthusiasm, had once described it clearly to the girls, its great skeins of little thread-like wires spread upon the walls, the myriad tiny opalescent discs contacted with the small gray rock surface under the tangled ma.s.ses of thread-wire, the levers and dials banked on the circular tables: they were unmistakable features.

"There it is, Snap," I whispered in his ear. "In that central rack.

Those insulated rods, see them? Anita told us they used them to adjust the discs. Watch out for the current."

"But it's off now, Gregg!"

"There's still danger in it, and you'd short-circuit somewhere. Keep your hands off. Use the rods."

"The operators...."

He got no further. A figure lunged into us from behind, a giant worker! His largest pincer bit into my shoulder; his hollow shout resounded. The operators of the control room came with leaps at us.

There was a moment of wild confusion. Light, seemingly almost weightless bodies flapped against us. Arms gripped us, but they were flimsy. The huge body-sh.e.l.ls cracked gruesomely as we struck with our solid fists.

A moment of turmoil pa.s.sed. No bolts were fired. The shouts were brief down here in the narrow confines of the tunnel. Panting, bruised more by our collisions against the rocks than by our adversaries, we ceased our wild lunges. We did not look at the scattered, broken and crushed bodies drifting now to the floor.

"Now, Snap! Hurry! Others may come."

We lunged into the glowing control room, seized the long insulated poles from the central rack. They had a grateful feel of weight. I picked one up, jumped with a twenty foot leap to the wall.

The wires came down like cobwebs under my sweeping blows; the little discs knocked off as though they were fungus growth. Sparks flew around us. Shafts of electronic radiance spat out. The wall was hissing over all its length as I ranged up and down it. The tangled broken threads of wire writhed like living things on the floor; then crumpled, fused and turned black.

I swept that wall-segment with frantic haste, lunged around and started another way. Across the room I saw Snap doing the same. A turmoil of electrical sound was reverberating around us, deafening, and the glare was blinding. A belt-shaft shot from the wreckage under my rod. It seared my left arm. My sleeve burned off; the arm hung limp and tingling at my side. I stopped to rub it; in a moment strength came back to its muscles.

Snap was raging like a great heavy bird gone amok. Through the green fumes of electrical gases which were filling the room I saw him lunging at the circular tables, overturning them. They cracked like thin polished stone as they struck the metal floor.

I finished with the wall. There was a twenty-foot square piece of metal apparatus, ramified and intricate; I heaved it over upon its side. A thousand little mirrors and prisms, dislodged from it, came out in a splintering deluge.

I was aware of Snap fighting with a brown-sh.e.l.led figure. Then he was free of it. I saw it mashed and broken at his feet as I dove past, swimming in the smoke to lunge the length of a great fluorescent tube which was still dimly glowing. My pole pried it over; it crashed with a brief puff of light and the rush of an explosion as air went into its vacuum.

I found Snap panting beside me, clinging to me in mid-air. The glare was dying around us; the din was lessening. We were choking in the chemical fumes of the released, half-burned gases. Turgid darkness was coming to the wrecked room, with little hissing flares spitting through it.

"Enough, Gregg! Listen! Up overhead...."

A great siren from up there was screaming into the night.