Lebanese military and parliamentary sources say Hezbollah is expanding a network of tunnels and underground passages around Ali al-Taher Hill in southern Lebanon, seeking to establish alternative supply routes as Israeli surveillance and airstrikes increasingly expose the group's traditional lines of movement.

The sources, cited by Erem News, said the network is being extended toward areas near Kfar Rumman and Nabatiyeh al-Fawqa, with long passages being dug and linked through underground junctions. The arrangement would provide multiple concealed access points as Hezbollah seeks to reorganize the routes used to move equipment and supplies to its positions in the south.

The reported activity comes amid growing indications that Israel has identified several of Hezbollah's supply routes and is targeting them with increasing precision. The group is also suspected of suffering human intelligence breaches within its ranks that may have helped Israel track movements and military shipments using drones.

A Lebanese military source told Erem News that recent Israeli strikes on bridges, wooded areas and specific routes appeared unlikely to have been random, suggesting they were based on detailed intelligence about Hezbollah's movements and supply lines toward Ali al-Taher Hill and surrounding areas.

The source said available information indicated that Israel had succeeded in recruiting individuals linked to Hezbollah in southern Lebanon, allowing it to obtain details about some movement routes and locations used to transport equipment.

That alleged breach has cost Hezbollah fighters, weapons and military equipment in recent days, the source said, prompting the group to look for routes that are harder to detect from the air, including tunnels, dirt tracks and mountain paths.

The source said one of Hezbollah's biggest vulnerabilities was no longer Israel's air superiority alone, but its difficulty in detecting human intelligence penetrations within its own organizational structure.

Similar vulnerabilities, the source noted, had previously emerged in the assassination of Hezbollah commanders and attacks on weapons depots and other sensitive sites.

Why Ali al-Taher Hill matters

The focus on Ali al-Taher Hill reflects the area's military and geographic importance to the movement of troops and supplies across southern Lebanon.

The military source said Israel has stepped up drone operations and airstrikes to prevent Hezbollah from turning the area into a major hub for redeploying fighters and equipment.

Israel, according to the source, believes Hezbollah is seeking to establish infrastructure that would allow it to operate safer supply lines and prepare for a prolonged confrontation while preserving its ability to move forces toward positions closer to the border and northern Israeli communities.

The Israeli strikes therefore appear aimed at disrupting the reconstruction of the network before it is completed, particularly by hitting bridges, roads and transit points linking different parts of southern Lebanon.

Hezbollah turns to mountain routes

Retired Brig. Gen. Marcel Baloukji, a military expert, said Hezbollah had been struggling to redeploy its forces for some time, given the strategic importance of the Ali al-Taher Hill area in connecting northern and southern parts of the Litani River region with the Bekaa Valley through a network of mountains and hills.

Baloukji told Erem News that Hezbollah's routes had not been completely severed despite systematic Israeli attacks on several bridges linking villages across the south.

The group has increasingly relied on valleys, dirt tracks and mountain roads that it had previously constructed or prepared, he said, reducing its dependence on conventional routes that are easier to monitor and target.

According to Baloukji, Hezbollah is also reactivating routes connecting southern Lebanon with the Bekaa Valley and extending farther north. The group retains, to some extent, the ability to move supplies toward the area around Ali al-Taher Hill.

But the extensive use of Israeli drones has forced Hezbollah to reduce the movement of weapons and ammunition stored inside villages and towns, particularly when supplies and equipment are being transported to fighters deployed near the front lines.

Baloukji said the significance of Ali al-Taher Hill extends well beyond the military position itself.

The area, he said, is a strategically important geographical junction influencing troop movements and transportation routes around Iqlim al-Tuffah, Sajd, Mount Rihan and Jezzine.

He also said the confrontation around the area could involve forces beyond Hezbollah, alleging the presence of Iranian, Iraqi and Yemeni personnel alongside the group's fighters. Those claims could not be independently verified by Erem News.

For Hezbollah, losing its position on Ali al-Taher Hill would therefore represent more than a battlefield setback, Baloukji said. It could also carry psychological and political consequences within the group's support base in southern Lebanon, given the strategic importance the area has acquired within its broader deployment network.