Ever use a Spray Foam to help insulate your home?
Spray foam (expanding foam in the UK) is a chemical product created by two materials, isocyanate and polyol resin, which react when mixed with each other and expand up to 30-60 times its liquid volume after it is sprayed in place. This expansion makes it useful as a specialty packing material which forms to the shape of the product being packaged and produces a high thermal insulating value with virtually no air infiltration.
Spray foam insulation, like other insulation, saves on energy costs and lowers utility bills. Studies by the US Department of Energy show that 40% of a home’s energy is lost as the result of air infiltration through walls, windows and doorways. Buildings treated with spray foam insulation insulate as much as 50% better than traditional insulation products.
Squirt a little of that stuff into the cracks & small openings that are letting that cold or hot air into or out of your home, and save on your electric bills. No air gets thru that stuff! I used it when building my small hut, and the interior stays cool in summer & warm in winter—electric bill is shamefully low ($74.73 for October, and has never been over $90 a month).
You have to be careful with it, i.e., spraying too much around a door jamb can warp the frame, damage the door, etc. Not sure what too much of it would do to a tunnels structure at the entrance of one (possibly causing tunnel to collapse??), but no air is going to get in that way.
Israeli troops could be planning to disable Hamas tunnels and trap the terrorists underground using innovative ‘sponge bombs’.
How to deal with concealed fighters hiding in the myriad of tunnels under Gaza will be one the main concerns for the Israel Defence Force (IDF) when they begin their long-promised ground offensive into the besieged city.
And according to some reports, a secret new weapon dubbed the ‘sponge bomb’ could see deployment for the first time.
Based around a liquid emulsion, the chemical compound can be dropped into a tunnel before rapidly expanding and hardening, potentially trapping attackers down alleys or securing safe routes for Israeli commandos while searching for hostages.
Conclusion
Those Gaza tunnels could end up being a mass grave site for Hamas. Throwing those ‘SPONGE bombs’ into an entry is certainly going to close it for a long time, and start cutting off air supply and the flow of air.
Apparently a lot of these tunnels are connected to the hospitals in Gaza—the hospitals acting as Hamas shields ‘for its tunnels and operational centres’. If the hospitals are actually hospitals, then the Israelis, along with some press reporters, should be able to enter them without a fight.
Sick patients have no need to be carrying guns and shooting inspectors. If there are any tunnels in them, then throw some humane ‘SPONGE bombs’ into the entries, and that will stop Hamas from using the sick hospital patients as shields.