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“Oh God!” Jim was white-faced. “Isn’t there anything we can do? Maybe if he doesn’t get our all-clear signal he’ll sheer off.” This was clutching at straws.

“Why should he? He must know how short-handed we are, and will simply think we’re not on watch, or that our signal lights are out of order. Matter of fact, if he were at all suspicious he should be alternating his course right now–and he hasn’t. Look.”

Seemingly motionless, but really splitting the ether with terrific speed, the warship was coming straight on to garrison the beleaguered post. She had never wavered from her straight course for the Dome. The little group was silent, watching the help that was coming at last, coming too late.

* * * * *

From below there came a thunder of sound. Jim slid down the stairs. An irregular disk on the wall was glowing cherry-red from the heat of the blow-torch without, and the metal was quivering under the Mercurian’s sledge-hammer blows. “Darl’s right,” he almost sobbed as he gazed helplessly. “They’ll be through in no time. The Dome’s gone, we’re gone, the space ship’s gone!”

“Let me pass, Jim.” Thomas’ quiet voice sounded behind him. Holcomb turned. His leader was in a space suit, the helmet still unfastened.

“Blazes! Where the devil are you going?”

“Here, cover me with this till I reach the gyrocopter, then get back quick, and seal the air-lock.” Darl thrust into Jim’s hand the ray-gun he had previously reserved. “There’s only one way to kill off the Martian and his mob. I’m taking it.”

Suddenly Jim Holcomb understood. “No, Darl, no–you can’t do it! Not you! Let me go! I’m just a dumbhead. Let me go!”

“Thanks, Jimmy, but it’s my place.” Darl’s voice was low, and very calm. “I was in charge, and I lost the Dome. If I can save the boys on the ship, and you two, it’s the least I can do. Good-by, old man. Give my regards to Earth.”

Thomas’ face was gray-white. The thick bandages that still swathed him, Jim glimpsed them through the open neckpiece of the suit, gave him the semblance of a mummy. The helmet clicked shut. Swallowing a lump that rose in his throat, Jim pulled open the door. A wave of Mercurians surged in, to be seared into nothingness by his weapon. He was in the doorway, his ray sweeping the platform clear.

Darl was out now, stepping into the flier that still hung by its hooked moorings. Jim caught a flash of blue and looked up. The Martian was hanging to a girder just above, his green tube pointing straight at Darl. A white ray spurted from Jim’s gun. The Martian’s weapon and the hand that held it vanished in the sizzling blast. The plane was loose! Jim leaped inside the air-lock, slammed the steel door shut, clamped it, and sprang for the quartz peer-hole.

* * * * *

Darl’s gyrocopter was diving on a long slant for the Dome wall. Faster and faster it went, till all Jim could see was a white streak in the smoky dimness. And now he could see the vast interior, the teeming plain, the dwarf-festooned girders and roof-beams. He stood rigid, waiting breathlessly. Then the plane struck–fair in the center of a great panel of quartz. The wall exploded in a burst of flying, shattered splinters. A deafening crash rocked the Dome.

Jim clung to his port-hole, tears rolling down his cheeks, unashamed. The plane, and Darl, vanished. Jim saw the black smoke masses whirl through the jagged hole in the Dome’s wall as the air burst out in a cyclonic gust. He saw the vast space filled with falling Mercurians, saw a blue form plunge down and crash far below. He knew that in all that huge hemisphere, and in the burrows beneath it, there was no life save himself, and Angus, and the faithful Ran-los. For only in this compartment that clung to the roof of the Dome was there left air to breathe. And, from the void beyond, the silver space ship sped on toward Mercury, sped on to a safe landing that, but for Darl Thomas’s sacrifice, would have been her doom….

Guided by Jim and Angus, a party of men from the battle-flier, equipped with oxygen respirators, went to the aid of Darl. They dug him out from under his crumpled plane and the piled splinters of quartz. His metal was dented and twisted, but unpierced. They carried him tenderly to the space ship, and carefully set him down. The ship’s physician listened long with his stethoscope, then looked up and smiled.

“He’s alive,” the doctor said, “just barely alive. The thick padding of bandages must have saved him from the full shock of the crash. They’re hard to kill, these ITA men. I’ll be able to bring him around, God willing.”