Personally, I believe they are not actual craft, but remotely-created portals. That is how, for example, they fly faster than the speed of sound without a sonic boom.
Ditto. More like holograms except they make waves when they enter the water.
Some scientists have suggested that they might be solid objects but they are not fully in our dimension, darting in and out between ours and theirs when we have seen them. This would make them quite similar to holograms except they would be detectable by radar and other imaging technology (which they are)...and give them the appearance of violating our physics in their movements when they actually do not.
I think you are on to something with the portal or hole theory, inter-dimensional possibly.
It wouldn’t surprise me if June rolls around and the US government continues the denial with a caveat, these are simply unidentified objects or events. And it wouldn’t surprise me to see them come clean—too a point to hide something else ongoing.
Face it at this point there isn’t any agency in the US government that can be believed. Either way the event will leave more questions unanswered than answered because of the never ending lies.
And those people who claim to have been abducted and found themselves inside of one?