The multi-crore makeover of Asia's largest slum has attracted big names, in fact it could be the battleground for the next major standoff between the Ambani brothers. They've fought over airports and power plants but now the next Ambani battle could be on home turf, Mumbai. Both Anil and Mukesh Ambani have shown interest in the world's biggest slum makeover Dharavi, Asia's largest slum 13 times the size of Nariman Point.