Israel is believed to have carried out hundreds of airstrikes against Iranian and Hezbollah targets throughout the Syrian civil war but has generally refrained from commenting about them for fear of being drawn into the fighting.
Citing intelligence assessments, Israel's outgoing armed forces chief, Lieutenant-General Gadi Eizenkot, told a local TV station on Saturday that the tunnels were prepared in secret, over a period of years.
"Hezbollah's operational plan was to use the tunnels weapon to infiltrate many fighters, between 1,000-2,000 terrorists, into the Galilee to seize communities here".
"According to our assessments, there are no longer any tunnels crossing into Israel", military spokesman Lt. -Col.
The latest tunnel, found on Saturday, began in the Lebanese village of Ramyeh, some 800 metres (yards) away from Israel, the army said.
Israel normally doesn't confirm individual airstrikes in Syria, unless they are raids against Iranian- and Hezbollah-linked targets in the country.
It included stairs, a rail system and a wide a passageway that allowed for the movement of equipment and a large number of forces.
"We have achieved the goal that we set out to achieve", he said. Israel reported the tunnel's discovery to UNIFIL, the United Nations observer force responsible for ensuring that southern Lebanon remains free of hostile forces.
The tunnel would be destroyed in the coming days, Conricus said, adding that while more tunnels still existed on the Lebanese side of the border, this effectively marked the end of the ambitious military operation.
Israel has called on the global community to impose tough sanctions on Hezbollah and act against the state within a state operation in Lebanon.
The military said its forces will remain in the border area to monitor any further underground activity.
The powerful Shiite Hezbollah group, which acts independently in Lebanon, has yet to comment on the tunnels. It said the Iranian-backed organization Hezbollah dug.
Israel has pledged to prevent Iran from entrenching itself militarily in Syria, where it is backing President Bashar al-Assad's regime alongside Russian Federation and Hezbollah.