Hamas leader Yahya Sinwar is believed to be hiding in the tunnels, protected by a human shield of hostages. Israel's most wanted man remains in the maze of galleries, likely beneath his hometown of Khan Yunis, according to Israeli and U.S.

officials. The man would be surrounded by hostages, in order to dissuade Israeli soldiers from neutralizing him, because this could lead to the death of those held. The vast network of tunnels built by the Hamas terrorist group under the Gaza Strip can be up to 750 km long.