Date of sighting: December 1, 2016
Location of sighting: Poocatepetl volcano, Mexico
Source photo: http://webcamsdemexico.net/colima1/2016-12-01/0940.jpg
While looking over a mexican volcano cam, I found one photo that had a UFO in it. The UFO was near the side of the mountain and was not seen in any other photos before and after that. This make me think that it entered the top of the volcano to enter an alien base 4km below the volcano.
On top of the UFO you see a small dome, which is also on the bottom of the UFO. This is a classic UFO design.
Scott C. Waring