The Shag Harbour UFO Incident was the documented impact of an unknown large object into Shag Harbour, Nova Scotia, in October 1967. The crash was investigated by various Canadian government agencies, and at least one underwater search was launched to recover remains of the object. The Canadian government declared that no known aircraft was involved and the source of the crash remains unknown to this day. It is one of very few cases where governmental agency documents have formally declared an unidentified flying object was involved. Several interviewed military witnesses, including a diver involved in an attempted recovery, have claimed an alien spacecraft was responsible. It was also claimed by several of the witnesses that the U.S. military was involved in recovery attempts. The case was also briefly investigated by the U.S. Condon Committee UFO study, which offered no explanation.