Way too expensive a way of killing rats in sewers. Too many buildings above the tunnels. The tunnels need to be cleared of terrorists & weapons, then systematically destroyed, even if you use the BBs.
If Israel could gas the tunnels, then do extensive recon, I'll bet they come up with a wealth of intelligence; enough to destroy Hamas & much of the regional terrorist networks.
Naturally, Israel wont use a WMD, even on tunnel scum, so the Israeli tunnel rats are gonna have a tough time.
I know they couldn’t, but I am sure we have something for this. If the scum set off a nuke the media would say it was Israel anyway.