It's not theoretically possible. Here's why the plasma hologram theory fails on so many levels.I don’t you you’re even realizing that statistically speaking the hologram tech is much more plausible than actual alien ships.
So it fine to hypothesize all sorts of fantastic attributes/technology to aliens, but not something that we are at least theoretically capable of doing?
No 1 - Plasma beam needs something to hold it together like magnetism. Then you must project that beam tens of miles away. That is not going to happen.
No 2 - Requires a tremendous amount of energy to project great distances. - No large ships outside the USN were present.
No 3 - Needs to be projected from multiple angles in order to create the hologram. - No large ships outside the USN were present.
No 4 - Due to the curvature of the earth these multiple energy sources must all remain within visual contact of each other in order to move the hologram to the surface of the ocean. - No large ships outside the USN were present.
No 5 - Neither surface level moisture or the aircraft flying around the UAP must not interfere with any of these beams or the hologram is lost.
IMO there's zero chance that these multiple UAPS were holograms of any sort.