The IDF released a video today showing the largest Hamas terrorist tunnel they’ve ever discovered. The video shows a large tunnel with a railroad track in the middle of it.

Here’s what the IDF says about it:

This massive tunnel system branches out and spans well over four kilometers (2.5 miles). Its entrance is located only 400 meters (1,310 feet) from the Erez Crossing—used by Gazans on a daily basis to enter Israel for work and medical treatment in Israeli hospitals.

This tunnel system was a project led by Mohammad Sinwar, the brother of Hamas leader Yahya Sinwar, and the commander of Hamas’ Khan Yunis Battalion.