Sub-Basement 4 was an subterranean cavern carved out of the Thames bedrock, designed to house the massive cryogenic propellant reserves necessary to feed the hypersonic wind tunnel. Steel piping insulated with vacuum jackets crisscrossed the ceiling, while enormous spherical tanks of liquid methane and liquid oxygen sat anchored into seismic shock-absorbing cradles. Normally, the air was maintained at a strictly controlled forty percent humidity to prevent static spark generation. Now,…
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