The cost to Dubai for the region's biggest underwater tunnel to connect two man-made islands is estimated at more than 11 billion dollars. The 1.4-kilometer long tunnel, named 'Arab Tunnel' and purporting to be one of the biggest engineering projects in the Middle East, will be constructed 6 meters underwater.

The tunnel will be 40 meters wide and, once completed, vehicles of up to four meters high will be able to traverse it.

The mammoth project is expected to be completed in three years.