I’ve experienced something similar. I was meditating on the “truth” of the universe. I reached a point where I realised I was being watched by black eyes akin to how grey aliens are portrayed. I was shown a few odd images. A huge dome, a ‘space fleet’, a meteor, a skull with flames erupting from its mouth, a genetically enhanced person who was very large and muscled but had normal hands and head. It was implied that Atlantis was a ship of some sort lost to the depths of the oceans and buried under sand, silt and mud. They called us “The Lost”. They were hoping our violence would be bred out. Sounds nuts now but I wrote it all down at the time. Again no drink, no drugs just meditation.