Premise: Princess Ragnhild Coast is the portion of the coast of Queen Maud Land in Antarctica lying between 20° E and the Riiser-Larsen Peninsula, at 34° E. All but the eastern end of the coast is fringed by ice shelves. It was discovered by Capt. Hjalmar Riiser-Larsen and Capt. Nils Larsen in aerial flights from the ship Norvegia on February 16, 1931, and named for Princess Ragnhild of Norway.
Hypothesis: The captains were forced to take aerial flights to discover the coast because they could not get the ship Norvegia around the ice shelves.