The answer is pipe roofing the technique of pre reinforcing the ground ahead of the tunnel face to ensure that the excavation can proceed.
Pipe roofing in tunnels.
Pipe roof is one of the tunnel support system used during a shallow tunnel construction.
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Pipe roofing is one of the umbrella arch methods where steel and or fiberglass pipes are installed around the tunnel periphery with an angle around 5 10 from the horizon.
In these areas tunneling can cause ground settlement endangering buildings and other structures on the surface as well as the people working inside the tunnel.
Some adventurers may open manholes from above with crowbars or specialized manhole opening hooks.
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As with roofs explorers bypass locks to enter mechanical rooms and the connected tunnels.
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The installation of the support utilizes the area around the crown and sides of the tunnel wall.