Israel has a new “weapon” called a SPONGE BOMB. It is really two chemicals when combined create a foam (similar what is used for home insulation).
The quantity used is enough to block a tunnel entrance / exit trapping anyone inside.
The problem is all they need to do is miss one exit. They probably have hidden emergency exits.
Only problem is hamsasses will dig all that crap out and have tunnels again. Blow them up and fill them with concrete.