Doorway Into Pluto Found In Latest NASA Photo, Jan 31, 2017, UFO Sighting News.

Date of discovery: Jan 31, 2017
Location of discovery: Pluto 
Source photo: http://photojournal.jpl.nasa.gov/jpeg/PIA21250.jpg

Pluto is 18% the size of Earth, and yet it has no shortage of alien secrets on its surface. Here is an entrance to an underground alien base on Pluto. This dark rectangular opening is close to 500 meters by 100 meters. You see, if you stay young forever, you will want to make sure you are safe in the location you are at. Underground living is actually many times safer than on the surface. But, the bad news is, if underground living is preferred to surface living, then it must be dangerous out there...so much so, that living underground is preferred. 
Scott C. Waring

Feb 2, 2017: PS, I've included below a great video UFO Mania of Youtube just posted today.