breaking the sound barrier without producing a sonic boom,[52] high maneuverability not able to be replicated otherwise,[53] long duration flight,[54] and an ability to submerge into the water. (hivelink)

or observer misperception, and require additional rigorous analysis.

(hivelink)
  1. The report indicated that, in most cases, the UAP recordings probably were of physical objects, and not false readings, as individual instances had been detected by different sensor mechanisms, including visual observation. tid:2930 (1) (hivelink)
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