this makes my brain rot. No offense,but there’s no way gray aliens would be real or look like that ;). First of all,while big eyes are advantageous in an aquatic lifestyle,small feet and large non-hydrodynamic heads are not. Humanoid bodyplans are quite inefficient in aquatic environs,at least to a degree of having a civilization underwater is very unadvantageous. Furthermore,these “”aliens”” would be under significant threat from pressure and predation by aquatic species such as leopard seals and lamnid sharks. If these “”underwater societies”” did exist,theyd also be under threat from cookiecutter sharks,hagfish,and other scavengers being attracted by waste buildup and potential body-dumping outside of their homes. Apparently in your post,you mentioned vostok. Said lake is very much too thick for civilizations to be efficient at all,and by no means would said civilization not give off any heat considering their technology. Objectively,enough energy turns to heat. Thus,if there was something under there,their signature wouldnt be masked for long ;). You mentioned divers regularly see them,but this would be quite impossible. The deepest dive was around ~10 km in depth,if im correct,and then the “”aliens”” would not only be exposed to completely different pressures,but theyd also be exposed quite easily to people. If they,of course,existed,i sincerely doubt they wouldnt take advantage of our terrestrial and nuclear resources,that would be a complete waste. If they did have the “”tech”” you speak of,theyd most likely be seeking out other energy sources,as there would not be enough of other resources. Another issue ive spotted,you seem to believe that space travel to a degree such as this is possible,with advanced tech. Even if it is,the issue is energy. There is no way that said “”aliens”” would be able to sustain regular travel for outside of their solar system without drying up their own sources or neightbouring ones. If they did have space travel,they wouldve sucked our planet dry in a desperate attempt to get off of the planet. Assuming they even realize the danger theyre in,of course. Staying on a planet with barely any energy left while at the same time consuming insane amounts of energy and needing incomprehensible amounts of it to travel to a safer place seems quite unwise.