All-Weld is capable of producing a variety of ASME and Pressure Vessel for Human Occupancy Standard Decompression Chambers. A decompression chamber is an integrated component of the Tunnel Boring Machines used to construct subways and other vehicle transport passages. Construction employees must undergo compression in order to [REASON], and then must be decompressed upon returning. The completed tunnel sits at atmospheric pressure, while the surrounding area is pressurized to minimize ground water […..]. As the tunnels are bored, the soil is removed by screw conveyor. This was All-Weld’s only full diameter chamber capable of sealing the contour of a tunnel. .