Anything is possible, but it just seems highly unlikely that some other country is this far advanced without us knowing about it. Of course, this could be our own government just not wanting to admit we're not number one in technology, not by a longshot if this is the case, and then they have to try and manage the political and civil fallout from the reality that we have adversaries which are way beyond what we can handle. For now I like the interdimensional travel theory.
Nuclear drones zipping around the ocean experimenting with microwave weapons doesn’t sound that wild to me. Did you know our military is phasing in laser weapons?
