Israel's military is using a range of technologies to detect and destroy Hamas' network of tunnels in Gaza, including surveillance drones, bunker-buster bombs, bulldozers, attack dogs, and robots. The aim is to minimize the risk to soldiers by blocking and damaging the tunnels, rather than sending troops in. However, experts warn that without ground forces, it is difficult to assess the extent of the damage. Hamas is considered a terrorist group by the US and European Union.