Photo: stellalevi / E+ / Getty Images
And you've heard of Sponge Bob, but what about a sponge bomb?
Israel may use the new weapon to seal off Hamas tunnels.
The bombs consist of a liquid emulsion that swiftly expands and hardens in the tunnel allowing the IDF to wall off Hamas fighters while searching for hostages.
The Hamas tunnels stretch for hundreds of miles underneath the Gaza Strip which is just 25 miles in length.