The history of the creation of Hamas underground tunnels and the Israeli army's fight against them. The Israeli army has published footage of Hamas underground tunnels discovered and destroyed. Now underground tunnels are the main problem of the Israeli army, the fact is that Hamas does not enter into open confrontation with the Israeli army. Hamas' tactics are to go through a tunnel to a point and attack military equipment from it. Underground tunnels began to be created 30 years ago, the total length of tunnels under the Gaza Strip is now about 500 kilometers. Usually the height of the tunnel is 2 meters and the width is 1 meter, but there are also tunnels in which a passenger car can also pass. The tunnels are laid at a depth of up to 70 meters and they usually lead from the Gaza Strip to Egypt and Israel. Tunnel exits are difficult to detect and are located in homes, hospitals and even schools, as reported by the UN in 2022. The main purpose of the tunnels is to smuggle goods and weapons from Egypt, attack Israeli settlements, soldiers and take hostages. The tunnels are also used as bases for the manufacture and storage of weapons, hospitals, warehouses and for holding hostages there. The Israeli army destroys the tunnels, filling them with concrete and water, striking the places where the tunnels are discovered, but this fight does not bring much success, since the creation of new tunnels is ongoing. This process especially accelerated in 2006 when the Hamas group won the elections in 2006 in the Palestinian Authority. The tunnels are being built by residents of the Gaza Strip hired by the Hamas group. The salary of builders is from 150 to 300 dollars, the working day is up to 12 hours, the speed of creating tunnels is up to 5 meters per day.