We literally have tunnels that run under oceans, but you know best.
Why do you assume it is going to be an exact copy of the Vegas loop? We have no details other than it is probably going to be a tunnel since it is the Boring Company. But that tells us very little on what would actually be the transportation method.
But yeah, shout out that they should have done the skyliner. Will that run under or over the interstate? How does that do during adverse weather conditions again? Or do a light rail...what is the best path to position that? Without understanding the logistics for every system, it is easy to have an opinion. It is just uninformed.

It seems the district is going a certain direction...I am sorry you don't agree with their choice.