You’d think that anyone contemplating digging a tunnel of this nature would have serious reasons to do so. But there just aren’t any. Back in the 1930’s, a road was built to Milford Sound from the local town of Te Anau, up the Eglinton valley and through the Homer tunnel, at great cost and effort. This remains the only route to Milford Sound today and it is well maintained.
Visitors from Queenstown can easily get to Te Anau by a direct road up wide valleys, serviced by buses. There’s no need for more roads and tunnelling in a desperately sensitive area.