project are completed on schedule.
The Arriyadh Development Authority (ADA) conducted a tour
of the operations for the media on Wednesday, 25 meters
underground on the 1.6 km-long green line running along
King Abdulaziz Road.
Journalists were able to see a tunnel boring machine in
action. They were accompanied by Al-Waleed bin
Abdulrahman Al-Ekresh, director general of the ADA for
development and integrated utilities, who briefed the media
on the operation covering the two parts of the project — the
metro and the public buses.
The machines used to carve out the tunnels also line the
walls with concrete as they move along, and include safety
and air-conditioning systems and the automatic processing
lines that carry away waste material.
There are seven gigantic machines, each between 90 and
120 meters, and able to dig away daily 50 truckloads of
earth. Each machine weighs about 2,000 tons, the
equivalent of four 747 jets with full cargo.
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