Deadman’s Island in Kent served as a burial ground for convicts who died on ‘prison ships’ in the 18th and 19th centuries, and is now known for its haunting shoreline littered with human remainsDeadman’s Island in Kent served as a burial ground for convicts who died on ‘prison ships’ in the 18th and 19th centuries, and is now known for its haunting shoreline littered with human remains