UFO seen as submarine in Chuckanut Bay

Summary

A 1955 report describes a black object shaped like a submarine observed in Chuckanut Bay, Washington. Witnesses saw it for 30 minutes before it submerged. Despite multiple identification options, investigators concluded it was not a balloon, aircraft, or astronomical phenomenon, but something related to a submarine. This civilian and military sighting was sent to various air and intelligence units for analysis. The detailed description and duration of the encounter generated interest, though no photos or radar were used. The nature of the object remains a mystery.