Elon Musk recently took part in the Boring Company information session, presenting the concept of boring and answering boring questions, which is something he's not always keen on doing.
The Boring Company Information Session - concept map
The Boring Company was established to solve transportation problems and alleviate soul-destroying traffic. According to Musk, there is no way up (air) and we can't rely on roads/highways for mass transit, but there is a way down, as you can build a lot of tunnels.
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At the current stage it's hard to say how the business will progress, but Musk seems to be convinced that tunnels are the solution - there is nothing to fear down below. No sound requirements. No neighborhoods to pass through. And so on.
You can watch the full presentation with videos and questions down below.
The Boring Company Information Session - FAQ