From the History Channel - January 2006:
'Deep Sea UFOs' Aired on Monday, January 23, 2006 at 8:00pm ET - Detailed examination of the little-known phenomenon of USOs, or Unidentified Submerges Objects an advanced type of UFO that can operate just as efficiently in water as in the atmosphere. These supposed otherworldly vessels have been reported, some believe, as far back as ancient Egypt. Others believe that USOs were reported by Alexander the Great and Christopher Columbus, [who allegedly was caught up in the Bermuda Triangle] and might have been seen in Atlantis.
Highlights of the show included the 1967 Shag Harbour Incident, a government-documented USO crash off the coast of Nova Scotia, Canada, and a trip to the area around Laguna Cartegena in Puerto Rico, a reported hotbed of USO activity. Interviewees included the US Navy's Bruce Maccabee, UCLA's Kathryn Morgan, as well as USO and UFO experts Stanton Friedman, Bill Birnes, and Preston Dennett.
In third dimension - the sci-fi drama series we consider our true reality at the moment - one would have to wonder about the agenda of aliens who live beneath the water - and yet we have come to realize that much is hidden from the public above - so why not below?