R/V Marcus Langseth is research vessel owned by the National Science Foundation and operated by the Lamont-Doherty Earth Observatory (LDEO) of Columbia University as a part of the University-National Oceanographic Laboratory System (UNOLS) fleet.The Marcus G. Langseth was dedicated on December 4 2007, came into service in early 2008, replacing the R/V Maurice Ewing.Langseth is intended primarily to collect multichannel seismic data, including 3-D surveys.