stuck in a metal capsule in a tube deep underground
Not to worry!
Early designs are for a tube above ground.
Probably made from carbon fiber reinforced paper mache.
A can opener or Swiss army knife would permit your exit.
“Probably made from carbon fiber reinforced paper mache”......”A can opener or Swiss army knife would permit your exit.”
Exactly my expectations.
To me, these things have one set of great beneficiaries - the “infrastructure” construction industries and their unions, and no matter how much they involve “private” investors, the ax almost always falls on the taxpayers and is NEVER sustainable on the fares alone.