IDF claims it has found the "'biggest Hamas tunnel" near Gaza border, Erez crossing. The tunnel ran down diagonally to a depth of 50 metres, where it expanded to a relatively capacious 3 metres (10 feet) in height and width, with electrical fittings. IDF put the full length of the tunnel at 4 km (2.5 miles) - enough to reach into northern Gaza City. Israel also claims this tunnel was built by Muhammad Sanwar, Yahya Sanwar's brother.