In this book Verne struck again the bolder note of imagination and creation. Here the daring explorers are represented as actually attaining the pole; and the bold inventions of what they saw and did, rising to the startling climax of the volcano and the madman's climb, are led up to through such a well-managed, well-constructed and convincing story, that many critics have selected this in its turn as the most powerful of Verne's works. It is notable that, with the exception of the open sea and the volcano, the world which our author here penetrates in imagination, coincides closely with that which Peary has discovered to exist in reality. Here are the same barren lands, the same weary sledge journey, the same locations of land and sea, the "red snow," the open leads in the ice. Verne's predictions, wild as they sometimes seem, were all so carefully studied that they shoot most close to truth.