It doesn’t take much high tech to wipe out terrorists in tunnels. All Israel has to do is make Cyanide bombs, plug the openings and if anybody is in the tunnel, they are dead. My dad did this when he wanted to wipe out gophers.
http://en.wikipedia.org/wiki/Cyanide_poisoning
But none of the gophers had respiratory protective devices I assume(?!). Some of the terrorists may have, so I suggest rinse and repeat, rinse and repeat.
Rovers could be redesigned to navigate very long tunnels and to stop near the origin shaft for a more effective delivery of some kind of incendiary or chemo agent.
OTOH, you could start dumping dry ice into the tunnels, and state that it’s part of Israel’s contribution to sequester carbon (in more ways than one).
First you have to find the tunnels. That is the hard part.
Pump natural gas into the tunnels. Throw in something that goes bang with a spark.