Captain Roald amundsen, discoverer of the South Pole, in speaking to the Press of the hardships which the members of the Belgica expedition withstood says: During the winter scurvy broke out and at the same time several of the party showed signs of mental trouble.
"My Attainment of the Pole"
Frederick A. Cook
amundsen as to Hillary across the South Sea face, yet this Matterhorn has a logic and bedevilment all her own.
"Sympathetic Magic"
Paul Cameron Brown
The above is covered in detail in similar words on pages 19, 20, 23 Volume One of "The South Pole" a late book by Captain amundsen.
"My Attainment of the Pole"
Frederick A. Cook