Question: For which feat of endurance is the Norwegian explorer, photographer, writer and former deep sea diver for the oil industry whose diving was mostly carried out in a marginal sea of the Atlantic Ocean located between Great Britain and Scandinavia and whose name is Børge Ousland, best known?
Sentence (from "Greenland Sea"): In general usage the term "Arctic Ocean" would exclude the Greenland Sea.
Relevant evidence: No