What do we know about Hezbollah's tunnels?

The Iran-backed movement has exchanged regular fire with Israel in support of its ally Hamas since the Palestinian militant group's October 7 attack on Israel sparked the Gaza war. Prospects of full-blown conflict grew after Iran and Hezbollah vowed revenge for the killing last month, blamed on Israel, of Hamas leader Ismail Haniyeh in Tehran, and an Israeli strike that killed Fuad Shukr, a top Hezbollah commander, in south Beirut. Nicholas Blanford, a Beirut-based Hezbollah expert and senior fellow at the Atlantic Council...