YouTube channel from 2016-2019 about mkultra, British royal family and tunnels being under Disneyland

Im looking for a YouTube channel that was deleted 5 or so years ago. The show was great, high quality documentary style YouTube videos about mkultra, the British royal family and tunnels being under Disney land. I think his name was Jay Der (not Jay Dyer) and he was a white guy in his 20s or so. Long videos about 2 yours long in some cases. Any ideas on where I could find his videos?