Could there be civilisations thriving deep in the oceans or even inside of the planet? ๐ฝ๐

Could there be civilisations thriving deep in the oceans or even inside of the planet? ๐ฝ๐
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Absolutely, my understanding is that the natural evolution of inhabited planets is to the interiorโs to avoid the atmospheric destruction and the natural cycles of planetary development, ice ages, volcanic eruptions, solar flares, plate tectonic activity, magnetic pole shifts. There are species that have existed on/in this planet that have been here for millions of years before humans ever danced the light fandango under the pale moonlight.
ASHN