This video explores sites submitted in the comments of another video. At each site, I believe there are features that do not look natural, but I also accept that they could be the result of improper data interpolation or some other reasonable explanation.
If underwater megaliths or cities were discovered, our government would definitely attempt to hide it from the public. There are too many areas on Google Maps where small portions of what looks like man-made structures are smudged out or obscured.
The US military recently revealed that they do actually investigate UFOs that have been monitoring their military exercises. If the occupants of these UFOs are not from other planets, it makes sense that they would live in the planets deep oceans.
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