The IDF has perfected underground warfare. The sponge bomb is a new one. They know how to use dogs in underground warfare.
If people don’t know what the Sponge Bomb is let me try to explain.
It is basically a much bigger version of the cans of Spray Foam you can buy at the home centers used for filling gaps with foam insulation.
When the IDF finds a tunnel entrance they send robots and other devices to clear that end/entrance to the tunnel.
They may then insert smoke bombs to indicate other entrances to the same tunnel.
Then they will put a Sponge Bomb down the entrance to seal it off.
The Sponge Bomb blows up and expands to fill the last 20-30 feet of the tunnel so that the Hamas guys in the tunnel can not double back on them once they advance further.
In addition the bomb has a sensor in it that if someone starts chipping away at the foam they can detect it.
Genius