Many people have made videos or written articles on this area of the Santa Monica Bay which some claim is the entrance to an underwater UFO base. Others have said that it is an entrance to underwater bases used by the US military.
The top section is about 250 feet below the surface of the water and the bottom of the structure sits in water that’s about 1800 feet below the surface. The top of the structure is just over 2 miles long and I believe the entire thing is just over 1200 feet tall. It have 5 large pillars that hold up the top section.
This area of Southern California gets many UFO sightings and it has gone on for many years.