The Israeli army said that it started building an underground defense system, on Sunday, along the northern border with Lebanon, to prevent what it called "cross-border tunnels."
"We are deploying a defense system on the ground (...) at various locations along the border," said IDF spokesman Jonathan Konricus.
According to Conricus, excavations will start in the town of Misgav General, to monitor tunnels, to deploy the new noise detection technology.
The move comes a year after Israel completed a process to destroy the tunnels, called the "North Shield."
The tunnels that the Lebanese army accused the "Hezbollah" of digging along the border with Lebanon.
The Secretary-General of the Lebanese "Hezbollah" Hassan Nasrallah acknowledged at the time the existence of tunnels in southern Lebanon, but he refused to specify who dug them and when, and mocked Israel because it discovered the tunnels after "many years."
"The drilling operations are not related to any new intelligence," said the Israeli army spokesman, and all military activities will take place on the Israeli side of the border.
It is expected that work will continue in the town of Masjaf in several weeks to install the sensors along other parts of the border.
"We realize that our activity will be visible and most likely it will be heard on the Lebanese side of the border," Konricus added.
Israel said it had notified the United Nations peacekeeping force in Lebanon, UNIFIL, of the matter.
The peacekeeping force is patrolling along the "blue line" established by the United Nations after Israel withdrew from southern Lebanon in 2000.
Israel destroyed a series of what it described as "offensive tunnels" last year, which Lebanese Hezbollah dug under the border between the two countries.
The Israeli move comes after the commitment of Hezbollah, Iran's ally, to respond to the killing of Quds Force commander in the Iranian Revolutionary Guards, Qassem Soleimani, with a US raid in Iraq on January 3.