The Headline is journo ignorance.
The article says “quickly sealed the tunnel entrance.”
The term Bomb is in my view a misnomer taken up by ignorant journalists who lack understanding of urethane foaming process. I believe the foam is some form of urethane that very quickly creates a closed cell foam blob that expands to fill an enclosed cavity
You can buy it in small cans at Lowes or Home Depot to foam up
and seal cracks and small openings
The use to seal tunnels is a brilliant use of materials
OH yes....... The Raptor You Tube Channel is in my view hands down the best reporting of the events in Gaza. They report at least twice a day
Isn't it temporary, can be drilled thru?