The truth is that nobody knows in depth how the propulsion systems and/or alternative systems of these ships work. Let´s say that depending on the phase that these vessels are, one system could have priority over the other and eventually in our atmosphere, the object could behave like an ordinary hovering aircraft.

There are, to be noted, reports that states that these alien crafts are extremely light while on the ground and could be lifted with a single hand. That was published long time ago by the brazilian magazine "Planeta" when referring to Roswell UFO.

Therefore UFO Sightings sees the Tepoztlan Incident - Calos Diaz, as one of those to be further debated, awaiting for new data and/or events.

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