Valving gas, Gerta thought. Negative buoyancy.
As if to confirm it, the falling-elevator sensation grew stronger. The nose of the dirigible tilted upwards and the engines roared as the captain controlled the rate of fall with the dynamic lift of air rushing under the great hull. She tasted salt from the sweat running down her face. Any second now.
“Ready for it!”
The commandos were bracing themselves with loops set into the aluminum deck planking. Gerta snugged the carrying strap of the carbine tight and ran both arms and a foot through the braces. The engine roar died suddenly, down to idle. Into the moment of silence that followed came a grinding, tearing clangor. The ship wrenched brutally, struck, bounced, struck, flinging her body back and forth. Then it came to a queasy, rocking halt with the floor at an angle. The bellow of valving gas continued.
“Now! Go, go, go!”
Booted feet slammed against quick-release catches. Two dozen segments of floor plating fell out of the belly carrying the coils of rope with them; light broke into the gloom of the hold, blinding. Men and women moved despite it, in motions trained so long that they were reflex. Twenty-four jumped, wrapped arms and legs around the sisal cables, and dropped out of sight. Others followed them with the regular precision of a metronome. Gerta and the headquarters section went in the third wave, precisely thirty-five seconds after the first.
Noise hit her as she slid out of the hold, into the giant shadow of the huge structure overhead. The Sieg was shifting, beginning to bob up a little as the weight left it. The pavement of the tower’s flat roof was only eight meters down, less than a third the distance the teams sliding down into the fortress courtyard had to cover. There were half a dozen Imperials below her, gaping and pointing at the dirigible overhead. They didn’t start to move until shots and screams broke out below. There was a moment of controlled fall and she struck the ground, rolling off the segment of decking and reaching under the horizontal drum magazine of the Koegelmann to jack the slide back. The blowback weapon was new; it had a grip safety that was supposed to keep the bolt from racking forward.
She’d found that the safety wasn’t completely reliable. A really sharp jar could send it forward, chambering and firing a round. Not a good idea to arm it just before you jumped down a rope.
Gerta came down in a perfect four-point prone position and stroked the carbine’s trigger. It roared and hammered backward into her shoulder, spent brass tinkling on the painted metal surface of the towers top. The bullets were pistol-caliber but heavy, 11mm, and they were H-section wadcutters. They punched into the Imperials with the impact of so many soggy medicine balls, blasting out exit wounds the size of teaplates. The rest of the section was firing as well. Seconds later, the area was clear of living enemies.
Something whirled by overhead, towards the heavy disk-shaped metal hatch that led from the rooftop down into the main section of the tower. A man was standing on the ladder below. His face was gray with shock, but he was struggling with the massive covering. The stick grenade struck his hands where they rested on the locking wheel of the hatch. He screamed and sprang backwards off the ladder, falling out of sight. The grenade hit the lip of the entryway, spun twice and then toppled out of sight down the shaft after the Imperial soldier.
The hatch fell, too, pulled past its balance point before the Imperial noticed the grenade. Gerta came off the ground like a spring-launched missile, diving forward to try and jam the butt of her carbine into the gap. Halfway through the movement the grenade went off below, but though dust and grit billowed out, the pressure wasn’t enough to slow the several hundred kilos of mass. It whumped down into the locking collar and the butt-plate of her carbine rang against it with a dull clank. She flipped up to her knees and reached for the small close-set wheel in the top of the mushroom-cap hatch. Three others joined her, but the wheel turned irresistibly under her fingers, and she could hear the holding bars sinking into their sheaths. The locking wheel on the inside was much larger than the topside equivalent, with greater leverage.