On 8 January 2015, Egypt's expansion resulted in the destruction of about 1,220 homes,[22] while destroying more than 1,600 tunnels.[23] Some tunnels discovered ranged over 1 kilometer long and contained lighting, ventilation and phone systems.[24] The total cost of this phase of the buffer zone is expected to cost $70 million.[25] In February 2015, in response to the buffer zone, ISIS beheaded 10 men they believed were spies for Mossad and the Egyptian Army.[26]