This incident is one of the first UFO / alien encounter reports of the modern era. In May 1940 at Boulder Mountain, Montana, a returned Mormon missionary and miner named Udo Wartena witnessed a large disc shaped object about 35 foot high and over 100 feet across hovering above a meadow. The object resembled two soup plates, one inverted over the other and stainless steel in appearance. Wartena then saw a staircase unfold from the bottom of the craft. Out of it came a man who asked him if the ship could take some water. The man then invited Wartena inside the object. Wartena accepted and met another man inside who told him they had come from a distant planet and were 609 years old. Though it sounds a bit hokey, it still remains classified as a standard cases and never proven either way. The case was first mentioned in James L. Thompson’s 1993 book 'Aliens & UFOs: Messengers or Deceivers?'