Ocean Cay is an island in the Bahamas located in the district of Bimini. It is located 20 miles south of Bimini proper. Ocean Cay is an artificial island which was built by dredging in the late 1960s by Dillingham Construction of Hawaii and was used to mine white Aragonite sand for diverse industrial purposes. The cay has been redeveloped as a private island called O…Ocean Cay is an island in the Bahamas located in the district of Bimini. It is located 20 miles south of Bimini proper. Ocean Cay is an artificial island which was built by dredging in the late 1960s by Dillingham Construction of Hawaii and was used to mine white Aragonite sand for diverse industrial purposes. The cay has been redeveloped as a private island called Ocean Cay MSC Marine Reserve for MSC Cruises.