An anti-tank missile stockpile and heavy machine gun positions aimed at IDF posts were also found in the vicinity of the tunnel.
Additionally, soldiers located "Burkan" missiles, mortars, and other ready-to-use weapons.
The IDF said the strikes were part of its attempts to "prevent Hezbollah from re-establishing weapons smuggling routes."
Israeli strikes reported in southern Lebanon • IDF finds weapons, explosives in pharmacy in southern Lebanon • Sirens sound across central Israel following Houthi missile launch
Israel and Hezbollah agreed to a US-brokered 60-day ceasefire that calls for a phased Israeli military pullout after more than a year of war.
IDF intelligence branches spent years separately diagnosing each level of Hezbollah's firepower.
The IDF also said on Wednesday that it killed 3,851 Hezbollah terrorists and wounded around 9,000.