Mumbai, April 13 -- Everywhere you go, they're digging. Drains are being widened in one place; roads are being repaired in another. And every detour you take is partially closed off to build the ColabaBandra-Seepz underground Metro. This is unusually high subterranean activity, which prompted a friend to wonder what lies beneath the Mumbai we know. Thankfully, in the last decade, a fair number of secrets have been unearthed. Take a look:...