Where does Israel's destruction of underground Hezbollah base leave the group?

Israel's demolition on Thursday of a tunnel network used by Hezbollah as a command centre in southern Lebanon, near the border, represents a significant setback for the Iran-backed group.

Experts said that while Hezbollah is far from defeated, the group was now exposed after two fierce wars with Israel in which it suffered major blows including the loss of much of its top leadership and Israel's occupation of parts of southern Lebanon.

- How big of a blow is it? -

A week after capturing the site, the Israeli military on Thursday demolished the tunnels in the Ali al-Taher ridge with huge explosions. The United States Geological Survey reported a 4.1 magnitude tremor in the area.

Hezbollah never acknowledged losing the strategic highland, which lies around 10 kilometres (six miles) from the border with Israel and overlooks the major city of Nabatieh.

The Israeli military previously said that the network comprised tunnels containing dozens of Iranian-made rockets, missiles and drones, as well as other weapons.

Experts say the tunnels, built over two decades, connected a network of villages in the area, and that the Israeli military now had easy access to Nabatieh, where Hezbollah holds sway.

"This is a major loss, they cannot make another (headquarters) like it for decades to come," Khalil Gemayel, a retired Lebanese general told AFP.

"Hezbollah is now exposed in the area around the ridge," he added.

Reacting to the tunnels' destruction on Friday, Israeli Defence Minister Israel Katz said "now there is a strong security zone, stronger than ever before, which protects the communities from attack and direct fire, and enables us to maintain control and threaten Hezbollah deep inside the area".

- Is Hezbollah militarily defeated? -

While a significant moment, Gemayel believed that "losing Ali al-Taher does not mean Hezbollah is broken".

Israel occupies a swathe of southern Lebanon, where Hezbollah built a now-dismantled network of tunnels near the border.

The group still maintains its major positions in Iqlim al-Tuffah -- a higher-altitude part of the south further away from Israel -- in the Jezzine highlands elsewhere in the south and in the Bekaa region in Lebanon's east and northeast.

"The facilities present in Iqlim al-Tuffah are bigger than (Ali al-Taher)," according to Gemayel.

But Hezbollah no longer has a weapons supply route through Syria, where the new authorities there are hostile to the group.

Military expert Hassan Jouni also said that "the fact that Hezbollah did not carry out a major operation in Ali al-Taher to defend it is a sign of weakness".

Hezbollah has not claimed any attacks on Israel and its troops since June 20 while Lebanon reports regular, sometimes deadly Israeli strikes despite a months-long truce.

Israel has accused the group of attacks on its troops in that time.

- Where does the group stand now? -

Hezbollah twice sparked wars with Israel in recent years, the first time with its attacks in support of Hamas during the Gaza war, and the second in March in support of Iran.

Jouni said that while "Hezbollah lost a solid, fortified defensive base" when Israel took Ali al-Taher, "it is not a devastating setback".

"It has gone through unprecedented setbacks before the issue of Ali al-Taher, especially with the assassinations and the (Israeli army)'s ability to occupy a vast area" of southern Lebanon, he said.

During these wars, Hezbollah lost several of its top commanders, including its former chief, while an Israeli operation in September 2024 saw hundreds of Hezbollah pagers and walkie-talkies explode, paralysing the group's communication systems while killing dozens and wounding thousands.

More than 8,900 people have been killed in Israeli attacks since 2023, according to Lebanon's health ministry. Hezbollah does not disclose how many fighters it has lost, but most people killed in the war have been adult men.

On top of these setbacks, Hezbollah is also dealing with a Lebanese president and prime minister who have vowed to disarm it.

The group's weapons have long been a point of contention in the country, with critics accusing it of using them to support Iran's regional agenda to the detriment of Lebanon.

Hezbollah is also facing some scrutiny from its core support base, the Shia Muslim community.

In online petitions posted earlier this month, hundreds of Lebanese public figures, including legal experts and human rights advocates, called for Lebanon's army to be deployed in Nabatieh and Tyre, two of southern Lebanon's largest cities.

"This city does not belong to any political group," said the signatories in the Nabatieh petition, referring to Hezbollah.