sentences:  Some artifacts, depending on type and density, can take anywhere from weeks to years for full conservation before they are placed on display in the museum.As of December, 2015 the upstairs exhibits, in addition to the slave ship "Henrietta Marie", included displays about a group of freed slaves in Key West in 1860, the preservation of items recovered underwater, and Caribbean piracy.A popular tourist feature was a solid gold bar that could be lifted by visitors in a plexiglass case.