Yes - it drills small-diameter tunnels capable of taking people under things like rivers. They migh accommodate small cars in one direction at a time. I think they are only about 4 metres diameter, so the headroom won't be much once you've installed a flat roadway, either.
The Boring Company's name surfaced a few weeks ago in Britain when it allegedly proposed one passing below the entrance to Poole Harbour, on the Southern English coast.
Presently the crossing, of only about half a mile I think, uses a chain-ferry capable of carrying a dozen or so vehicles at a time, including buses and lorries.
Quite how or why Mr. Musk's lot might have an interest here is hard to see, especially since it would presumably charge a toll for its limited use (cyclists and pedestrians only) so you may as well pay the fare for the ferry for a rather more pleasant way to cross the waterway.
It seems an odd choice of business for Musk anyway. He is not an engineer. His technical qualifications are in computing; but he employs engineers to design his cars and rockets for him - nothing to do with civil-engineering.
Yes, you can avoid the ferry by driving round; but Poole Harbour's full extent makes it one of the world's largest natural harbours; and the detour adds over twenty miles to the trip between Corfe Castle and Poole, the nearest opposite-bank towns!
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As for the QR code allegedly revealing Nazi symbols.... if so that's anyone's guess why, and probably best ignored.
