[2] Hussar (IV) was designed by Cox & Stevens and built in 1923 by Burmeister & Wain[4] in Copenhagen for E. F. Hutton and his wife Marjorie Merriweather Post.

[6] Upon her completion in Denmark King Christian X was invited to inspect the ship prior to its maiden crossing to New York.

[8] In the late 1920s the Huttons decided they wanted a larger yacht, so they commissioned the construction of the Hussar (V) (later Sea Cloud).

Displaying a black hull, she was used to collect samples of seawater and sediment cores, measure currents and heat flows, perform underwater photography and seismic studies, and map out ocean floors.

[1] Notable scientists who worked aboard the Vema include Maurice Ewing, Bruce C. Heezen, Ralph (Ralphy) Roessler, J. Lamar Worzel,[14] Jack Nafe, Frank Press, and Walter Pitman, all of whose work was greatly facilitated by Marine Technical Coordinator Robert Gerard, who was responsible for the fitting and refitting of LDEO marine research vessels from the Vema through her successors, the Conrad, Eltanin, and RV Maurice Ewing, including the design and installation of numerous pieces of customized scientific measurement equipment critical to their research.