People who instantly believe every thought that occurs to them aren't conspiracy theorists per se, but there's not a lot of cleavage in that Venn diagram.
Isn't that an actual scientific theory about it? That it could have an ocean of liquid water under the surface of ice? Maybe I'm thinking of a different moon...
That's Europa. The thinking is that Europa may have life in its oceans beneath the ice that feed off of geothermal vents and therefore don't require any sunlight.