An unidentified flying object has been filmed from a mountain overlooking top secret US air base Area 51.
Hikers scaled Tikaboo Peak in Navada to overlook the secretive base which is thought to be where the latest aircraft technology is tested.
Speculators claim the mysterious US Air Base has been closed down - but YouTuber Adventures with Christian captured helicopters, trucks and planes there.
And 11 minutes in to his 22-minute video a strange floating white UFO can be seen close to a plane entering a hangar - though it is unlikely to be alien activity.
A huge new hangar can also been seen. The largest change to the base in almost ten years, the hangar is 210 feet wide by 250 feet long and very high.
One of the HH-60 Pave Hawk helicopters, that provides security for Area 51, is also captured flying along the edge of another mountain between Tikaboo Peak and the base itself.
As Christian, who climbed the mountain with his son Sean, edits the video he points out a plane going in to an aircraft hangar.
Just seconds later he says 'just saying but that flipping thing is weird. Go back and check it out better' as he places a circle around an object to the left of the hangar.
A white disc appears to hover above the space to the left of to the aircraft hangar as the plane makes its way through the structure before emerging out the other side.
The image is blurry and it is difficult to tell what the white object is and whether it is actually hovering.
Another jet is then filmed travelling the opposite way along a runway as Christian says: 'This is very exciting for me.'
In another hour long video Christian documents his climb up the mountain and explains his use of rocks and tape to remember his route back.
Christian and his son Sean are forced to scale the peak as snow falls down on top of them. And by the time they reach the summit thick clouds block any view.
But fast moving winds drag the clouds away and the sky clears up enough for the father son duo to see the air base clearly.
And, despite a few issues with a shaky camera, Christian captures trucks moving around and even pans the camera to show other buildings and runways.
During his time at the mountain peak Christian also captures a Janet plane -- used to ferry workers between a special section of McCarran International Airport in Las Vegas and the base at Groom Lake.
The base was created in April 1955 by the Central Intelligence Agency (CIA) to develop reconnaissance aircraft.
But the US government did not admit to its existence until June 2013 - in a response to a 2005 Freedom of Information request.
The airfield on Groom Lake was first in operation during the Second World War when, in 1942, it was used as Indian Springs Air Force's Auxiliary Field.
It began as two unpaved 5000-foot runways.
Though clouded in secrecy the base is thought to still develop CIA high-altitude spy plane technology.
Although conspiracy theorists have claimed it is where alien spaceships are taken if they crash land on earth.
The development of aircraft within Area 51 led to an increased number of reports of UFO sightings as jets began to fly higher than they had in the 1950s.
While commerical jets flew at 20,000 feet, and military jets at 40,000 feet, Lockheed U-2 aircraft flew at 60,000 feet.
And when their wings caught the reflection of the sun more people reported UFO sightings to the government. The sightings could be explained but the secrecy of the U-2 project meant those who reported seeing UFOs were never told.
Christian often explores the Nevada Test and Training Range (NTTR) and also climbed Mount Tikaboo last year to see the site.
His video shows a weather station installed near Tikaboo's summit that may also serve as remote surveillance.
It is thought cameras capture any observers on the peak who might see clandestine flight test operations.
And when they are seen it has been claimed operations may be postponed to avoid prying eyes getting a glimpse in to CIA projects.
Despite seeing runways and hangars many of Area 51's operations are thought to occur underground - although a hidden railway system has been denied.
Christian said: 'Area 51 from Tikaboo Peak the base is very active. A great look into Area 51 just as the snow stopped.
'I never wanted to go on Tikaboo Peak or the mountain I found myself on last year. To get the best video, and pictures of Area 51 out there it's about me laying my eyes on the base, and getting my own video, and pictures.
'I do feel the weather had a lot to do with the great shots I was able to get. Between the snowstorms, and clouds the base would just illuminate long enough for me to film, and take pictures.'