The Mataf area was increased by 60,000 sq.m. to accommodate 90,000 worshippers where the total capacity of the Grand Mosque after completion of all projects will accommodate 1,850,000 worshippers. The report highlighted that this expansion is considered the largest expansion in history where the latest construction and modern systems techniques are used. The report pointed out the tunnels, where the length of pedestrian and emergency tunnels are 5,313 linear meters, tunnels of electricity and services are 1,922 linear meters and tunnels of sewage with diameter of 2800 mm are 4,643 linear meters. The report pointed out that the project contains advanced electro mechanical systems, including sound systems with a total of headphones with 4,524 headset in addition to systems of fire alarm and hygiene. Requirements of the radio and television are provided through rooms and areas for installation of the equipments, cameras and antennas in addition to provision of new radio and TV studio at the services building with 44 cameras. There will be new control cameras where some of the cameras will use "IR illuminator" system in order to operate in cases of emergency with total number of cameras (6,635 cameras). --More 17:25 LOCAL TIME 14:25 GMT www.spa.gov.sa/w