One snippet of info about this incident caught my attention -
"One theory links 20 defence tech experts on board to electronic warfare"
'Cloaking' technology has advanced a long way since it was first practiced disastrously by way of the Philadelphia Experiment
Philadelphia Experiment - Wikipedia, the free encyclopedia
Although that experiment was declared a hoax (they would say that wouldn't they
), there are witnesses still living who swear it happened.
This could be another experiment gone wrong.
OR
Another seemingly outlandish possibilty is a 'quantum leap' to one of the limitless number of parallel universes