After narrowly escaping the Shoggoth, Dyer and Danforth return to their plane, determined to leave the Antarctic behind forever.
The clouds part just long enough to offer a glimpse of those other, distant, supernaturally huge mountains...and the mysterious light they emit.
As they fly away into the raging wind, Danforth witnesses something which causes him to lose his mind. Dyer ends his story by restating his plea that all must stay away from the antarctic.
Yet, he remains troubled by one thing: what exactly did Danforth see?