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"The first California underwater UFO was on July 7, 1947 when two San Raphael teen-agers saw a "flat glistening object" emerge from the water, fly around and then dive back into the water 400 yards from shore. Throughout this same year, numerous steamers reported a mysterious 'undersea mountain' or a 'large mass underwater' which kept appearing and disappearing in various locations in the San Francisco Bay and down the coast.
Following this, the sightings came regularly, in 1951, 1954, 1955, 1957, 1962, 1964, 1970, 1980, 1990, 1991, 1993, 2004 the list goes on, most from the Santa Catalina channel. The sightings involve many highly credible witnesses including lifeguards, security guards, law enforcement officials, military officers and countless citizens.
UFO/USO Reports from the Santa Catalina Channel