Kansas farmer Will Keller was fleeing a tornado on June 22, 1928, when he turned at the door of his cyclone cellar and looked up:

To my astonishment I saw right up into the heart of the tornado. There was a circular opening in the center of the funnel, about 50 or 100 feet in diameter, and extending straight upward for a distance of at least one half mile, as best I could judge under the circumstances. The walls of this opening were of rotating clouds and the whole was made brilliantly visible by constant flashes of lightning which zigzagged from side to side. Had it not been for the lightning, I could not have seen the opening, not any distance into it anyway.

Only a handful of people have witnessed this sight and lived.