Tyler Glockner, the man behind YouTube's most popular UFO and alien-related channel Secureteam10, has also admitted to Express.co.uk he once disguised his own voice to appear as that of an alleged source in one of his videos. Yet, Mr Glockner today stood by his outlandish "cube" video and a follow-up that claimed the event actually happened, saying it was all "real". The video entitled '[MIND-BOGGLING] Black Portal & Alien Cube UFO Over Texas' has been branded poorly made, photoshopped and fake by a series of UFO debunkers, some of who have placed Mr Glockner on UFO website and YouTube channel blacklists for his alleged crimes against ufology. The video first emerged in June 2015 and claimed a "terrifying black cube was snapped over El Paso on the Texas border" just a few miles from White Sands – the infamous US military testing site where the world’s first Atomic bomb was detonated. It has been viewed more than a staggering 3.6 million times.

SECURETEAM10*YouTube This 'UFO cube' was faked, claim debunkers, but Tyler Glockner insists it was real.

The clip was looked at by the US-based Mutual UFO Network (MUFON), which is the world's largest organisation dedicated to UFO and alien research. Fletcher Gray, lead MUFON investigator in Texas, said at the time: "If you blow the thing up, you can see too many pixels." Various debunkers claim some YouTube channels such as Secureteam10 use outrageous claims and footage to attract maximum views and benefit from advertising revenue from YouTube. Debunking website UFO Theatre estimated in April that Secureteam10 could pull in as much as £230,000 a year from advertising, but he was at risk of losing it die to changes in YouTube policy. Mr Glockner, who today had nearly one million (958,228) subscribers to his channel, maintains he is just a genuine UFO researcher trying to "get the truth out there."

Secureteam10*YouTube Tyler Glockner has an army of UFO buff followers on YouTube.

But aside from the shocking cube claim, his videos have included ridiculous allegations including: *That video of a Hayabusa capsule re-entry from 2010 was recent "leaked" footage of an “alien satellite shot down by the Illuminati”. *There are towers built on the moon *That time lapse video of a helicopter was alien technology being tested over France *Humans have lived on Mars for many years and Google's April Fool's day images of a space station on the Red Planet may actually be real

CLOSE-UP images of 'ALIEN CUBE' Tue, March 7, 2017 Can you guess what this strange cube could be that was spotted in Texas? Play slideshow Youtube/secureteam10 1 of 20

A new attack comes from YouTube's TheOutThereChannel which has a video exposing how Mr Glockner apparently distorted his own voice to give the impression he had spoken to an alleged NASA and NSA source Dr Eric Norton. In the Secureteam10 video entitled 'Nasa whistleblower reveals about L-shaped ships on the far side of the moon', 'Dr Norton' discussed the craft being on the lunar surface. TheOutThereChannel used software to strip back Dr Norton's voice, to reveal it was in fact Mr Glockner's. In an earlier attack by YouTube channel Dazzathecameraman, the debunker analysed an outlandish claim made in a Secureteam10 video entitled 'Leaked? Giant body behind Saturn Entering Solar System - cover up'. The video made the far-fetched claim that a massive unknown planet had been filmed entering our solar system behind the ringed planet, but it was being withheld from the public.

Have hoaxes made their way onto my channel in the past? Sure, but that's the game. I've sharpened my eye a lot since then, and I know what to look for. Tyler Glockner

The video played what it said was a recording of a source - an astronomer from the W M Keck Observatory on Maunakea in Hawaii, called only Ken, who supposedly work led for a government agency. He spoke over an alleged genuine image showing a large plant behind what appeared to be Saturn. Express.co.uk had an exclusive Twitter exchange with Mr Glockner, after putting these claims to him. He denied being responsible for hoaxing any material himself, but accepted he may have inadvertently shown other people's hoaxes in the past. He said: "I don't 'hoax' anything. "Have hoaxes made their way onto my channel in the past? Sure, but that's the game. "I've sharpened my eye a lot since then, and I know what to look for."

After being met with claims the original cube video was digitally created, he posted a follow up with an unidentified female witness to the event. He added: "I'm extremely careful, and the Texas cube was most certainly real, as was the interview I did with the woman who witnessed it." He then turned to the claims that his own voice has been digitised to sound like sources speaking off camera in his videos. He said: "I admitted in the VERY video that I recreated the voice audio for Ken, who WAS a real person, but didn't want their voice out there. "I admitted this in the description of that video the day I posted it, so I find it hilarious that all of these haters have left that little detail out of their stories."

SPOOKY moment UFO posing as a plane DISAPPEARS Thu, March 9, 2017 A UFO posing as a plane disappears from the sky, stunning onlookers Play slideshow Youtube/secureteam10 1 of 10

Whereas some UFO YouTubers who have come under fire have claimed it was CIA trolls out top discredit their work, Mr Glockner claimed jealousy from rivals was responsible. He said: "I run the biggest channel in ufology with nothing but love from millions of fans. "Everyone has a few haters, and that's fine. I pay no attention. "I run this channel and I do my best to filter out the nonsense. "Trolls constantly attack me as being a 'hoaxer', and yet anyone can go through the videos I post on day to day and see that's completely UNTRUE." He said other YouTube channels that used "blatant CGI fakes" were getting less flack, adding: "I'm getting attacked for something that I posted back when I very first started the channel, and that wasn't even a hoax?