Is Barak a wastrel or what?

Quite a news item:

Barak suggests tunnel connecting between Gaza, West Bank

Defense minister says 'we can reach Palestinian territorial continuity by digging a 48-kilometer tunnel between Beit Hanoun, Hebron at reasonable cost of $2-3 billion'.

First of all I know some people who will do it for free.

Then - how does Barak know there isn't already such a tunnel?

Cross-posted on Yourish.com.