A mysterious US Navy sonar recording revealed an "unusual trench" on the seafloor, as scientists are now looking into the possibility of 'underwater aliens'.
Timothy Gallaudet, the former head of the US National Oceanic and Atmospheric Administration (NOAA), said the strange anomaly seen on the seabed off the coast of California had baffled oceanic experts.
He said the sonar indicated that "an object has crashed into a ridge and then skidded to a halt". The former US Navy Rear Admiral has spent the last 18 months interviewing dozens of sailors, submariners, military personnel and members of the US Coastguard, all of whom have seen unidentified objects in the water, amid speculation over alien crafts.
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