This is kinda interested and sort of strange, and that it wasn't discovered earlier.
"May  2014 The depth from the surface of the water to the top of the structure  is is 450 meters or 1476 feet and to the bottom of the entrance is 700  meters or 2296 feet. Below are an additional nine images taken from due  south looking north, going around and ending due north looking south  towards Los Angeles and Santa Monica".
Source: Third Phase of Moon UFO
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UFO base cave found off of Malibu, California coast ? (video)