Question: Helmer Julius Hanssen, was a Norwegian sailor, pilot and polar explorer, he participated in three of the polar expeditions led by Roald Engelbregt Gravning Amundsen, was a Norwegian explorer of polar regions, he was the leader of the Antarctic expedition of 1910–12, which was the first to reach the South Pole, on which date?
Sentence (from "Helmer Hanssen"): He participated in three of the polar expeditions led by Roald Amundsen and was one of the first five explorers to reach the South Pole.
Relevant evidence: Yes