The Gaza region is on the Red Sea, and the underground is mainly sand and gravel, and the waterproof ability is very poor. Unlike clay, water is difficult to penetrate. As a result, Hamas has largely no effective countermeasures to the flooding of seawater into the tunnels.
No matter what kind of "meditation design", dealing with seawater irrigation tunnels is nothing more than two ways: "blocking" and "guiding".
block", you can use a sealed door to separate the confined space, so that the water cannot enter, and there is enough food and drinking water inside, and it is best to have a dark airway to pass the outside air. In this way, the tightness and pressure resistance of the blocking doors and their durability are key. The concealment of the airway is also important.
guide", which is more difficult in tunnels below sea level. I'm afraid it's unlikely that there is a dark river underground. If the geology of the area is a large rock with many crevices, the water will seep away. I can't fill it for a long time. But will that kind of geology be in that area?If so, it should have been infiltrated by seawater a long time ago, right?Sand absorbs water?I'm afraid the capacity is limited. In order to prevent the infiltration of groundwater, the tunnel may be isolated from the soil with reinforced concrete.
In short, long-lasting irrigation is a great test for the people in the tunnel. Hamas should immediately retrofit the tunnel to prevent flooding, reinforcing and narrowing all inlets so that they have enough time to divert water even if it enters the tunnel. There are more sandbags in the tunnel to block the water when it sees. Find the right time, blow up the pumping equipment, and completely foil the Israeli conspiracy.