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.

Several dozen senior US Navy officials told him about witnessing “phenomena in our oceans, the tropical eastern and western Pacific, the Gulf of Mexico, the Caribbean, Mediterranean, and the Indian Ocean, and the North Atlantic and eastern seaboard”.

Mr Gallaudet has now urged the Pentagon to shift its focus from UAPs (unidentified aerial phenomena) in the sky to the mysterious moving objects under the water.

Talking about the strange sonar finding, Mr Gallaudet told the Telegraph that he wants to send a remote-controlled submarine to the spot to see if there are signs of what caused the phenomena.

He said: “I cannot explain this feature and therefore want to use a ROV (remotely operated underwater vehicle) to dive from a ship and capture video of it. That may allow us to identify its detailed characteristics and potentially determine what caused it.

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