[Farmer Dean]

Find a tunnel,flood it with propane.The gas will find a source of ignition eventually.Or flood the tunnel with CO2.

[captain_dave]

...or you could fill it with expanding foam.

[broken_clock]

I recall hearing where the Israelis flooded some tunnels with raw sewage :)

[SunkenCiv]

One approach to good tunnel management is to locate them; dig a parallel tunnel for part of their length; pack with explosives; set it off when the tunnel fills with jihadists about to raid.

I’d prefer that the entire population of Gaza be rounded up and kicked out, perhaps dropped off in Yemen, or in Angela Merkel’s hometown.

[Cobra64]

Not CO2. Not very effective since we exhale CO2.

CO is deadly..

[Attention Surplus Disorder]

That’s been my idea, exactly. Just need an inflatable balloon at the source end as a dam. Drop in a drone with delayed action sparklers.

Anyway, 0bama will prohibit the import of any such system because it’s racist.

Note how the Israelis developed their system in several months. The US gov’t would have taken 7 years and 2.3 billion in cost overruns for the same result.

[Mastador1]

Find a tunnel,flood it with propane.The gas will find a source of ignition eventually.Or flood the tunnel with CO2.

A kindred spirit, Eh? I was thinking the exact same thing, treat the same as any vermin that infest your yard.