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Another challenge is to maintain or repair the face of high pressure machine. short trial months of sinking wells to freeze or dry the soil a common practice is contrary to the external pressure of compressed air. The workers usually divers can use the limited hours of work in such circumstances, and then is removed and a hyperbaric chamber. Vinci Group has had problems under the pressure of six bars, or six times the atmospheric pressure, and Jay Dee was told to prepare for a team under pressure for more than seven bars. In a 57-meter tunnel boring the world, which will replace the Alaskan Way viaduct, the State Department of Transportation provides pressure approaching the five bars only a short fragment.