Daniel Rothberg for ProPublica and Dayvid Figler, City Cast Las Vegas ProPublica is a nonprofit newsroom that investigates abuses of power. Sign up to receive our biggest stories as soon as they’re published.

Elon Musk’s Boring Company cut a 1.7-mile tunnel beneath the streets of Las Vegas that’s meant to offer a clean way of clearing up traffic in Sin City. Since it opened, the tunnel has drawn criticism for its high construction costs and relatively low passenger numbers compared with traditional mass transit systems like trains and subways.

Elon Musk could be the one to make talks of a transatlantic tunnel become a reality, according to a megaproject expert. A tunnel between the U.S. and Europe has an estimated price tag of $20 trillion but Musk has claimed his companies might be able to build the structure for a fraction of that cost.

Elon Musk’s Boring Company is constructing a planned 68-mile tunnel system beneath Las Vegas where drivers will ferry passengers around the urban core in Teslas. ・Less Regulation: Despite its size, the project,