Preface

Context: This article summarizes a recent Israeli military announcement that it demolished an extensive underground complex in southern Lebanon allegedly operated by Hezbollah. It explains the reported operation, local reactions, and the broader security and humanitarian context. The aim is to present a clear, neutral account of the event and its implications, drawing on the details released by Israeli authorities and publicly available monitoring data.

Lazy bag

Key takeaway: Israel says it used a large charge to collapse more than 2 km of tunnels under the Ali Taher Ridge, producing seismic effects and claiming elimination or flight of fighters. No immediate response from Hezbollah or Lebanon was reported. The action was described by Israel as a step toward creating a security zone in the south.

Main Body

The Israel Defense Forces (IDF) announced that it destroyed a substantial underground network in southern Lebanon, which it identified as a Hezbollah-operated complex beneath the Ali Taher Ridge. According to the IDF, the operation employed over 1,000 tonnes of explosives to collapse two tunnels that together extend for more than 2 kilometres (about 1.2 miles). The resulting blast was reported to have produced seismic effects consistent with a magnitude 4.1 event, a measurement referenced to the US Geological Survey. Images and footage released by Israeli authorities showed a large fireball and rising smoke following the detonation.

Local residents described a powerful explosion, with one resident in Nabatieh reporting that the sky lit up and that a loud sound and shaking—comparable to an earthquake—followed about 15 seconds later. People in nearby towns reported fear, families moving toward Beirut, and tremors felt tens of kilometres away, including in the coastal city of Saida.

The IDF characterized the destroyed infrastructure as a strategic, multi-decade construction effort that it attributes to Iranian funding and direction. Israeli statements said the facility included a command centre used by a Hezbollah unit, stored rockets, missiles, unmanned aerial vehicles, anti-tank weapons, mines and other explosives. The military said that all fighters inside the structure were either killed or fled, and that the destruction completed an operation to eliminate eight tunnels and to establish a local "security zone".

There was no immediate official reply from Hezbollah or the Lebanese government reported after the announcement. The destruction comes after Israeli forces took control of the ridge following months of fighting with Hezbollah. Israeli troops have expanded operations across parts of southern Lebanon and said they occupy a corridor described as a security zone near the international border.

Lebanese media also reported further Israeli strikes during the same period in other southern localities such as Nabatieh al-Fawqa and Mansouri, in the Tyre district. In response to growing tensions, the Lebanese armed forces increased deployments in some areas outside Israeli control to help stabilize locations and reassure civilians, according to local television reporting.

The clashes in southern Lebanon are a component of a larger regional confrontation that intensified on 2 March, when Hezbollah launched missile and rocket attacks into Israel after an airstrike that killed a senior Iranian figure. Israel replied with a wide-ranging bombardment across Lebanon and a ground incursion into southern areas. The conflict displaced hundreds of thousands of people across Lebanon, and Israeli forces continue to hold territory estimated at roughly 5% of Lebanese land.

Efforts to reduce violence produced a series of understandings in June involving the United States and Iran and a separate Lebanon-Israel arrangement. Under that framework, the plan envisages Hezbollah disarming, the Israeli military withdrawing gradually from southern Lebanese territory, and the Lebanese army deploying to reassert state control across the area. Hezbollah has not directly participated in those negotiations and has stated opposition to direct talks.

Despite those agreements and a general reduction in open fighting, incidents of strikes and demolitions in southern Lebanon have continued. Lebanese health authorities report heavy civilian casualties from the period of hostilities: their counts list thousands killed nationwide since the March escalation, including women and children, though those figures do not distinguish between combatants and non-combatants. Israeli authorities report casualties among their soldiers and a smaller number of civilian deaths on the Israeli side during the same timeframe.

From a strategic viewpoint, the IDF’s statement frames the demolition as removing a long-established subterranean operational hub that could threaten Israeli positions or be used to project force across the border. For residents in southern Lebanon, the blast and continuing military activity have contributed to displacement, fear, and damage to civilian infrastructure. International monitoring organizations and the humanitarian community continue to highlight the challenges of returning displaced people to affected areas while military operations and damage remain.

Reporting on the event included contributions from several correspondents in regional and international bureaus; as of the initial announcements, the broader diplomatic and security responses were still developing. Observers will likely watch for Hezbollah’s reaction, Lebanese state responses, any shifts in local frontlines, and additional humanitarian impacts in the coming days.

Key Insights Table