What technology? I'm a fan of Musk's work but this whole venture seems like a pet project for a fantasy he has of bypassing LA traffic in a private billionaire

What technology? I'm a fan of Musk's work but this whole venture seems like a pet project for a fantasy he has of bypassing LA traffic in a private billionaire tunnel. It's not clear they've identified an opportunity for some real technological or production advantages as with SpaceX and Tesla.