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Tohid Tunnel , Tahran , Iran

Tohid Tunnel is a tunnel in Tehran, Iran. It is about 3 km long.it is the third longest urban tunnel in middle east. it has also broken the record of construction to be opened in less than 30 months. it is interior technical design has met the highest safety licences.It includes installation of utilities equipment in the Tunnel, and manufacture and mobilization of north and south fans combined…
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