soon after his return from surat, shivaji maharaj embarked upon a vigorous naval program. shivaji maharaj had realized the importance of sea forts. sea forts would protect the navy and keep in check the siddi of janjira and the portuguese. he built suvarnadurg. in 1664 he commenced the construction of sindhudurg at malvan. about the same time, he strengthened a fort named vijaydurg. he also built a fort named padmadurg on a small island in front of rajpuri to counter the siddi power.