The Zero-Thickness Threshold

How did an infiltrator breach an exit that possessed height and width, but precisely zero depth?

Bai Jingxian crouched against the flattening bulkhead of Relay Station Nine, his right shoulder pressed into the sixty-degree lateral shear while grit rattled against his goggles. He needed to blow this door and get his boots onto open sand before the corridor squeezed his lungs flat. Three years of Hegemony infiltration contracts had taught him to pick tumblers, bypass retina scanners, and bribe dock masters, but none of his employers had budgeted for an exit turned into a flat sheet of colored glass. The blast door in front of him had ceased to be steel. Under the compression wave of the descending polyhedron, the doorway had collapsed into a two-dimensional geometric manifold—dead flat against the stone, offering neither keyhole, hinge, nor latch.

Behind him, the corridor ceiling creaked under immense torsional strain. The concrete arches were flattening layer by layer, losing their volume and pressing flat against the rear wall like pressed flowers in an archivist's ledger. A fire extinguisher bolted to the conduit crumpled into a circular silhouette with no mass, its gauge reading zero simply because the needle had lost the third dimension required to swing.

Jingxian pulled the Anomaly Telemetry Drive from his tactical harness. The coastal command had printed twelve exhaustive volumes on breaching hydraulic gates, pneumatic locks, and magnetic seals. None of those field manuals offered instructions for kicking down a barrier that possessed no reverse side.

He tapped the drive's diagnostic diode against his thumb. A slender beam of coherent crimson light lanced across the iridescent plane.

When the light struck the zero-thickness door, it did not reflect at a standard incidence angle. It refracted along the surface in concentric hexagonal rings, scattering into razor-thin interference fringes that crawled across the doorframe like geometric spiderwebs.

"Three minutes," Jingxian murmured under his breath, steadying his breathing against the sideways tug of gravity.

He adjusted his footing, locking the cleated edges of his combat boots into the sheared masonry floor. His newly initialized class pulsed along his marrow, setting up a sharp resonance across his ribs.

To break a two-dimensional lock, one could not apply brute force along a three-dimensional vector. Striking flat against the plane merely distributed the kinetic energy across infinity, absorbing every foot-pound without deformation. A lock with zero depth required force delivered entirely along its boundary axis—the single vertex where the flattened space met three-dimensional reality.

Jingxian shifted his center of mass down to his rear heel, tilting his upper body precisely twenty degrees off his established sixty-degree shear plane.

The concrete behind him let out a sharp, paper-dry snap as another ten yards of hallway flattened into a geometric sketch. The air pressure dropped violently, pulling the breath from his throat as the remaining three-dimensional volume in the vestibule shrank to a corridor barely three paces wide.

Jingxian rotated his front ankle outward by two millimeters, dropping his hip until the tension in his calf burned.

He drew his combat blade, reversing the grip so the hardened titanium-carbide edge aligned with the diode's refracted beam. Activating [Light-Bending Affinity], he focused the crimson beam into a needle-thin optical wedge, feeding the refractive distortion directly along the flat plane of the blade until the steel shimmered with indigo refraction lines.

With a short, explosive exhalation, he drove the blade's point into the upper corner of the doorframe.

He did not strike inward. He struck sideways along the zero-thickness seam.

The blade bit into empty air, yet the impact rang out with the deafening chime of shattered crystal.

A blinding pulse of cerulean light erupted from the strike point. The flat geometric plane buckled outward like a bent sheet of tin, peeling away from the doorframe in tearing triangular facets. Depth rushed back into the aperture with the roar of an atmospheric vacuum. The zero-thickness membrane expanded violently into three hundred pounds of crumpled, warped alloy, blowing out into the open night air.

Jingxian rode the backdraft, sliding low across the threshold with [Prismatic Vector Slide] before the corridor behind him flattened completely into an inert wall of solid stone.

He rolled across the coarse coastal sand, coming to a halt twenty yards out in the cool desert wind. Behind him, Relay Station Nine's reinforced bunker sat silent, its entrance compressed into a decorative bas-relief without an interior.

He pushed himself up onto one knee, shaking pulverized mortar and salt crust from his hair.

Jingxian caught his breath, feeling the dense weight of the new spatial stat settle into his muscles and joints. The lateral gravity shear did not pull at his spine with the same abrasive strain; his frame now held its own structural integrity against the warped environment, as if his mass had gained an internal counterweight.

He stood, dusted his tactical trousers, holstered his blade, and unclipped the Anomaly Telemetry Drive from his harness.

The device's interface screen lit up in vivid amber, parsing the compressed data stream he had extracted from the station's central array. Raw telemetry vectors cascaded across the panel, rendering a three-dimensional topographic map of Ouro-Vast.

Red descent trajectories traced downward from low orbit across the continent. Dozens of dodecahedrons and icosahedrons were not falling at random. Their descent angles formed a coordinated, interlocking net, all funneling toward a single geographic anchor point in the central interior: Ridge Four in the Granite Confederation.

Across the water, the horizon had warped into a stepped incline, the distant waves rising like stair treads against a purple sky.

A flashing warning banner pulsed across the bottom of the map.

Jingxian stared at the countdown as the numbers ticked down in cold precision. The coastal shelf was already losing its third dimension, and the only stable ground left on the continent was fifty leagues inland, surrounded by converging sky-borne monoliths.

He pocketed the drive, strapped on his sand-goggles, and turned his back on the rising sea.