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The Mumbai-Ahmedabad bullet train distance of 508km, has a 21km underground corridor from BKC to Kalyan Shilphata. Of this, 7km falls under the Thane creek, with 1.8km of it to be built under the sea bed, and the remaining under the mangroves marshland on either side of the creek.
A team of engineers from National High-Speed Rail Corporation Limited (NHSRCL), RITES Ltd, and Japan’s Kawasaki Geological Engineering has been studying the seabed structure. This involves firing a high-energy sound wave towards the seabed from below the surface of the water, and mapping the refracted sound wave to determine the density of the rock under the sea bed. Only a very dense rock can safely support a tunnel of this nature.
