Anyone notice the two bottles of water on the shelf?
Maybe left there by the maintenance crew. They have to install a new set of gaskets every time it's used; I read somewhere that there is only one manufacturer that can make them; each set is used only once, and costs around $20K.
Also notice the explosion-proof luminaire (lighting fixture) in the upper left of the chamber. Hydrocyanic acid gas is flammable, with a heat of enthalpy of -427 kJ mol−1; about 1/2 that of natural gas.