San Francisco — Elon Musk’s tunnelling start-up The Boring Company is working on much wider tunnels than publicly announced, which could hugely expand the reach of the business.

The tunnels that the company is pitching to potential clients are 6.4m in diameter, dwarfing the 3.7m tunnels the Boring has built to date. The wider throughway would accommodate two shipping containers side by side, according to a copy of a pitch obtained by Bloomberg...

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