Elon Musk abandoned plans for a four-mile tunnel at US airport. Locals are picking it up

The plan, which will now feature two tunnels stretching 4.2 miles (6.7km) for travel in both directions, is estimated to cost roughly US$492mil (RM2.2bil) and is expected take riders to their destination in less than 10 minutes, Watkins said. — Photo by Jakob Søby on Unsplash

Five years ago, tech mogul Elon Musk posited a way to curtail rush-hour traffic in Southern California: Build high-speed underground tunnels.

Among those plans, Musk's civil engineering firm, the Boring Co, submitted an unsolicited proposal in 2019 to the San Bernardino County Transportation Authority for a tunnel that would whisk riders from the Rancho Cucamonga Metrolink station to Ontario International Airport in just a few minutes.