Sargasso Weed or Broad-toothed Gulfweed (Sargassum fluitans) Sargassum Community and in the background Corwith Cramer. Corwith Cramer is a 134-foot steel brigantine built as a research vessel for operation under sail. Sargasso Sea, Bermuda | Der Forschungssegler Corwith Cramer durchquert im April 2014 die Sargasso See von Puerto Rico kommend bis zu den Bermuda Inseln.