Containment Engineering Standard T-11, with Cthulhu Eternal statistics
Failure report: Harker Deep Shelter
Harker’s original containment cell had exactly one wall between the specimen and the control room: 1.4 metres of irregularly poured magnetite concrete, with no door, duct, pipe, cable, or continuous reinforcement crossing the boundary. Cameras watched both faces. Food, instruments, and sedated test animals came in through a remote transfer system that never opened both shutters at once. The specimen tried to localize eleven times in six weeks, and every attempt failed. The review board called that an unacceptable margin.
So they installed a second shell inside the first, thinner but independently founded, and between the two shells the engineers left a thirty-centimetre service cavity so neither structure touched the other. The cavity was evacuated, instrumented, and lit. The final report described the design as two barriers in series and therefore safer than either barrier alone. At 02:13 on the first night of operation, the outer cameras showed the specimen standing against the old wall. The inner cameras showed an empty cell. At 02:14, a blue condensation appeared on the far face of the old wall, inside the service cavity, its outline too shallow to be an animal and too organized to be moisture, and the cavity instruments logged one pressure impulse while recording no gas. At 02:15 the duty engineer brought up the high-rate observation array. The condensation vanished. So did the specimen, from the outer cameras. Both walls stayed intact. At 02:16, something started breathing behind the control-room technicians. The second shell had supplied the intermediate state that made the passage easier.
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