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The concept that's taking shape blends two of Musk's passions that have been considered secondary to his day jobs as the CEO of the SpaceX rocket venture and the Tesla electric auto and battery venture.

The increasingly busy entrepreneur tweeted today that he had received "verbal govt approval" for The Boring Company to build a Hyperloop underground tunnel connecting New York, Philadelphia, Baltimore, and D.C. It would send passengers flying between the Big Apple and our nation's capital in less than 30 minutes.

Some city representatives, however, say no such talks have occurred. He established the firm earlier this year to build an underground web of tunnels beneath Los Angeles, through which cars can travel up to 130 miles per hour on metal skates.

SpaceX CEO and founder Elon Musk has downplayed the chances of a successful inaugural flight for his Falcon Heavy space launch vehicle.

Just who in the government gave this approval?

The Department of Transportation declined to comment and referred questions to the White House.

A spokesman for The Boring Co. did not immediately respond to a request for details. The Boring Company will need to secure city and state permits for such a project to commence.

Musk also originally came up with the concept for Hyperloop, though he opened up the idea to development by outside interests because he said at the time that he would not have enough time to devote to making it a business in its own right, in addition to his other duties. Garcetti said he was considering using Musk's tunnel to support a high-speed rail connection. Musk plans for the first stretch of tunnel to run from Los Angeles International Airport (LAX) to Culver City, then to Santa Monica, Westwood and Sherman Oaks. Speed-wise, he claims this will cut a journey from NY to Washington, DC down to a mere 29 minutes. "Which government was it, by the way?", tweeted Howard Sherman, an arts administrator at The New School, a private research university in New York City.

Musk and his team are now working on a 500-foot test tunnel in Hawthorne. He's been experimenting with tunnel digging in California, and founded the dad-joke-worthy "Boring Company", which was supposed to be solving LA's traffic problems by putting highways underground.

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