Sea water? Really?
What ever happened to TNT, dynomite, re-directed sewer, sarin gas?
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“What ever happened to TNT, dynomite, re-directed sewer, sarin gas?”
Well, they’re pumping it out of the Med, it might be close to sewer water, at least.
“..What ever happened to TNT, dynomite, re-directed sewer, sarin gas?..”
when you think about it... it’s actually a good idea.
if you want to know where all the entrances are...look for water pouring out of a house/building...
Sea water is very low cost.
Sea water is free and for the purposes of this exercise basically limitless. It is also harder to deal with than gas and will preserve some evidence while leaving the Israelis able to re-enter later while posing no risks to troops not in the tunnel system.
Additionally, flooding tunnels with water will often show you where *all* the hidden entrances are, unlike all the other agents you mention.
And finally, the only cost is the fuel to run the pumps.