I can sympathize, Austin TX is built upon a giant rock of limestone which extremely difficult to develop into. All of our mass transit options that have come up connect to no-where.
As a former tunnel boring engineer, I can attest that mining tunnels through consistent rock is vastly easier than through mixed geologies such as Manhattan island. Also there is less stuff (utilities, metal debris, etc) underground in Austin. There are undoubtedly historical reasons why Austin lacks sane transit but technical difficulties while boring is almost certainly not one of them.
