Dec. 1, 2015

Egypt Discovers Iron Tunnel Network under Gaza Border – Roi Kais (Ynet News)
Egyptian border guards discovered a network of 17 underground tunnels with walls of iron 40 cm. thick under the border with Gaza on Friday, according to Egyptian security officials.
Building such a tunnel would be extremely expensive. The Egyptian news portal al-Masrawireported that Egyptian officials believe Hamas used considerable funding from Qatar to construct the tunnels.