Sindhudurg, the Ocean Fort was constructed by the Maratha King Shivaji on a low island about 1 kilometer off Malwan. Probably Malwan was a port in ancient times. During Satavahana rule in this region the ports of Maharashtra were reached to their zenith. In course of exploration three

Triangular and three grapnel types of stone anchors were noticed at the entrance of the Sindhudurg fort. Anchors were made out of local available sand stones. Presently these anchors are cemented on the platform of the small jetty of the fort, presently, two other grapnel type of stone anchors are used as the mooring stones. The original place of these anchors is not known.

But, it should be from nearby area only, where there might have been a number of ancient wrecks. The submerged rocks of adjoining area caused for wrecks due to inexperienced navigation. Local fishermen informed about the several shipwrecks behind the fort.