During the most recent conflict in 2014, Israel destroyed 32 tunnels.
It also was the fifth tunnel from Gaza to Israel that has been destroyed in recent months, according to Conricus, and it reportedly extended tens of yards into Israeli territory.
The Israeli army destroyed a Hamas terror tunnel that stretched from Gaza into southern Israel.
The marches have been organized by Gaza's militant Hamas rulers, but large turnouts on two preceding Fridays were also driven by Gaza's dire living conditions and desperation among the territory's 2 million residents who have been enduring a crippling border closure by Israel and Egypt since 2007.
The tunnel went through a border section that Hamas, especially in the last two weeks, has turned "into an area of terror and fighting", Israel's military said.
The Egyptians fear the weekly demonstrations along the border between Gaza and Israel could spin out of control and lead to another military confrontation between Israel and Hamas, a Palestinian Authority official in Ramallah said on Sunday. Hamas did not comment. "We are protecting our boundaries", Conricus informed The Times of all Israel.
"There was no use of explosives, but rather, we filled the tunnel, which rendered it useless for a very long period of time". "When we receive something, we study its positive and negative aspects in a way that serves Palestinian interests".
The laboratory is the technological branch of tunnel detection, and it uses innovative ground research, which includes scanning of cavities and their dynamics, added the IDF.
In the meantime, Gazans continue their protests along the border wall with Israel, which have been going since March 30 with more than 30,000 protesters and are expected to continue until April 19, Israel's Independence Day.
Israel offered no explanation for its publication about the laboratory, which followed a surge in Gaza border protests that organizers want to peak in mid-May - the 70th anniversary of Israel's founding.
Hamas, which is sworn to Israel's destruction, has denied having any such plans.
Israeli Energy Minister Yuval Steinitz said geophysicists from his ministry were involved in the anti-tunnel efforts, as well as researchers from the Technion, an Israeli university, and from state-owned Rafael Advanced Defense Systems.