(JTA) – The Israeli military said it uncovered the “longest” and “most significant” Hezbollah attack tunnel on the border with Lebanon. The discovery of the nearly mile-long tunnel was made in the winter during Operation Northern Shield, which aimed to expose and neutralize cross-border attack tunnels, was announced May 26. The tunnel is 22 stories deep, or 260 feet, and stretches more than 250 feet into Israel, the Israel Defense Forces said, calling it Hezbollah’s “flagship” tunnel. Inside was infrastructure for lights, air conditioning, a public address system and stairs made of concrete. The IDF said the tunnel took years to build and would be destroyed in the coming days.