Given how much energy can be present inside planets and how water can persist underground so long as there is a stable water cycle in the atmosphere and planeta

Given how much energy can be present inside planets and how water can persist underground so long as there is a stable water cycle in the atmosphere and planetary surface, I have a feeling that (similar to earth) tons of life would be possible in the dark, feeding off of geological outputs. This kind of scenario seems like a potential hotspot for sources of life. Maybe not intelligent, but I’d be elated if we found it. Water is just an example here — who knows what’s possible.