India, June 13 -- Under the Horniman Circle Garden, in the heart of Mumbai's business district, lies buried a 178-year-old well that the city's cotton and opium traders depended on more than a century ago.

The well, less than 400m from Bombay Stock Exchange, used to be at the centre of what was then Mumbai's busiest exchange market for cotton and opium traders - the original Bombay Green or Cotton Green. Photographs of early 19th-century Bombay show hundreds of traders sitting under a banyan tree, around this well. They also show an old 'pyau' - or tap - on top of the well. Today, the only visible signs of the well's existence are that old banyan tree and pyau. And, no one would have ever known of it, had the pyau not been part of a rest...