We keep mixing the threads here. The Hyperloop is an unproven concept of vacuum tubes and very fast pods, which until implemented in real life somewhere in the world should not be taken seriously IMHO. Although it was first proposed by Elon Musk, it has no relation to the Boring Company, as far as I am aware, beyond some high words. Musk talks glibly of Loop and Hyperloop, but there is very little in common between them beyond the similar-sounding name.
There is a Boring Company general thread, where things like the LVCC "Loop" project should be discussed.
^^Ramen^^
I assume that sometime after construction begins the Las Vegas Convention Authority project will deserve a thread of it's own.
The three stations, which will
probably certainly be where the largest volume of dirt is removed will
probably certainly be dug by conventional means by digging down from the surface.
The 3 adjoining tunnels may or may not be built with Musk's Boreing Machine - I believe this will be dependent on the composition of the soil they encounter.
If it's "backfill" a quick push through with the Boreing Machine's a no brainer.
If it's not too deep and consists of virgin caliche, cut and cover with dynamite & large "dozers" makes sense.
If it's expansive clay, the Boreing Machine works, but heaves and subsistence will cause major problems and delays.
All of the above are possible in the Las Vegas Valley, and a mix of the above is possible, perhaps likely.
We've had Casinos that were sinking erratically at > 1 foot/year - a subdivision where they could never keep the street lights standing vertically, houses from splitting apart or the sidewalks aligned with the driveways.
For decades portions of Stewart Avenue were roped off with snow fencing as the road's surface would heave with 4 foot hills that came and went as the sun crossed the sky.
Mega projects have been abandoned when calichi was discovered, and concrete block walls require 1 foot below ground for every foot above ground. That 12' high fence you see in Las Vegas is 18 feet high. The 6 foot underground section is to keep the visible parts from crumbling or tumbling.
Las Vegas's surface geology appears benign - but it's not.
Think of the drunken forests with melting permafrost beneath recreated for your enjoyment in the desert.
Terry