They weren't going to send security. They were going to flood the tunnels.
As the gas began to fill the chamber, stinging his eyes, Jax didn't try to pry the doors open. He turned back to the fissure. He wasn't a ratter anymore. He was an intruder in a cathedral.
Jax approached the edge. He expected to see darkness. He expected to hear dripping water.
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The heavy blast doors at the tunnel entrance slammed shut with a finality that shook the dust from the ceiling. The hiss of pressurized gas began to fill the corridor.
They had built the entire metropolis above it to cap the pressure, to cage whatever this biological engine was.