Drive a 7 m earth-pressure / slurry / hard-rock tunnel boring machine under a living city. Every ring you build is 1.5 m of tunnel – keep the face stable, the lining on line and the buildings above happy.
Face pressure must sit inside the green window (earth + water pressure). Too low: settlement and sinkholes. Too high: heave and blow-out.
Advance, cutterhead speed, torque and thrust decide productivity; watch cutter wear and the geology ahead.
Steer with jack pressure (W/S/A/D) or let the autopilot help. Grout the tail void to limit volume loss.
Drag to orbit, wheel / pinch to zoom, right-drag or two fingers to pan. 1 2 3 switch cameras, Space pauses.
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