Earth may have underground 'ocean' three times that on surface

[Anomalocaris]

Any planet with an active hot core like Earth's will produce its own water, gases, and petroleum. Thinking that comets supplied the Earth with its water is similar to believing in angels.

No. Believing earth makes its own water instead of getting it from comets is similar to believing in angled because it goes against everything we know about chemistry, geochemistry and astrophysics. The very first, and insurmountable, problem you will encounter in trying to construct any scientifically plausible scenario of earth making its own water is earth lacks the raw material - hydrogen - to make water. Earth lacks adequate gravity to hold on to any free hydrogen, there is no plausible hydrogen containing compounds, besides water, that could have delivered chemically bounded hydrogen to earth in the amount necessary to make the water on earth. So the only way earth could have acquired the raw material to make water, is by getting it from cometary water. So earth water came from cometary water.

Cometary delivery of water, on the other hand, is consistent with our understanding of stellar formation, stellar chemistry, as well as multiple lines of direct observational evidence. It is not like believing in angles.

You need to stop beating this dead horse.