Vegas Loop isn’t just tunnels! In Vegas, besides 14 tunnels, TBC has built 14 stations (28 by end of year), 12 emergency egresses, 6 cross-passages, and 9 "knockout shafts". See below for the construction of a cross-passage connecting "Tunnel-1" and "Tunnel-2" (beneath Paradise Road) to provide access and egress; construction time is ~10 days. Steps: 1. If necessary, treat the ground (typically with grout) between the two tunnels such that it is stable during excavation. 2. Brace the Tunnel-1 wall with a steel frame and open up the concrete Tunnel-1 wall within said frame. 3. Excavate the dirt between the tunnels, installing steel ribs and wood lagging to maintain a safe roof until Tunnel-2 is exposed. This is a slow process of 10 feet per day. 4. Install waterproofing and rebar, the latter which anchors into both Tunnels 1 and 2 (see pic) 5. Install solid steel liner plate (see pic) 6. Pour high-strength concrete around the liner plate, reinforced with the rebar from Step 4 7. Open up Tunnel-2, finalizing the connection Finally, the cross-passage is built out with a walking surface, ventilation, fire suppression valves, fire-rated doors, safety equipment/sensors, lighting, and cameras.