The military said the tunnel began near the southern Gaza city of Khan Yunis and reached an Israeli kibbutz.
The tunnel, reported on March 20, was said to be the longest and deepest discovered by the Israel Army.
The source said the 2.5 kilometer tunnel, believed to have been constructed over the last six months, penetrated several hundred meters into Israel. They said parts of the tunnel, lined with cement and containing tools, reached a depth of 20 meters.
Israel's Channel 2 shows video of the tunnel, all built with that concrete that we are told is in such shortage in Gaza.
It includes electricity and phone lines.