The Black Douglas (later teQuest, Aquarius, Aquarius W; now El Boughaz I) is a three-masted staysail auxiliary schooner built for Robert C. Roebling (great-grandson of John A. Roebling and grand-nephew of Washington Roebling) at the Bath Iron Works of Bath, Maine, and launched on 9 June 1930. Designed by renowned New York naval architects H.J. Gielow & Co., she is one of the largest steel-hulled schooners ever built.