The Israel Defense Forces claims to have discovered “the biggest Hamas tunnel” in Gaza, spanning a length of four kilometers (about 2.5 miles), Paralel.Az reports citing CNN.

The IDF said the tunnel, secured “a few weeks ago” but revealed to the public Sunday, is wide enough to drive a large vehicle through, reaches up to 50 meters (over 160 feet) underground and is equipped with electricity, ventilation and communication systems.

It does not cross into Israel but ends 400 meters before the now-closed Erez crossing on the northern Israel-Gaza border, according to the IDF.

The tunnel is part of Hamas’ “strategic infrastructure” and would be destroyed, the IDF said.

In a video shared by the IDF, the Israeli military claimed the tunnel was created for Hamas troop movements and as a launching point for attacks.

Footage shared by the IDF and allegedly filmed by Hamas to show the construction of the tunnel shows a large vehicle driving into the tunnel and a makeshift railroad inside it.

CNN could not independently verify the footage or the IDF’s claims.

In a statement Sunday, the IDF alleged that the tunnel system was a project of the brother of Hamas leader Yahya Sinwar, Muhammad Sinwar. The IDF did not provide any evidence to support the claim.