No, we live in a world where people talk 'big' and throw numbers around randomly, and that particularly goes for newspaper articles. By the time any tunnel is built we shall probably be flying around in something totally different.

And to quote the last lines of a 'Game of Henge' by Philip Goss

"You want out? Good - that's
the game. Whichever way you turn
are doors. Choose. Step through, so...
And whichever world you stumble into
will be different from all the others, only
what they might have been,
you'll never know"