This is ?Kolaba Fort? at Alibuag in Maharastra dist. near Mumbai-India. This fort was built inside the sea, 2-3 k.m. away from the cost of Alibuag. The only chance to get in this fort is when the water level goes down, then one can walk in that fort. This fort was built to fight against British, Portuguese navy who attacked India 3400-400 years before. The Greatest ?Chatrapati Shivaji Maharaj ? (Lord Shivaji) Who made the history in Maharastra had built this wonderful series of sea forts at costal area.