If you’re asking if it’s possible there could be life underground it’s definitely not impossible. Archea on earth lives in similarly extreme environments.

Basically you need at least two conditions to exist: liquid water for chemistry and an energy source. It’s possible. It won’t be very complex, you aren’t going to find a cavern full of dinosaurs, but simple cellular bacteria? It isn’t impossible to imagine conditions that would be compatible with some of the extremophiles that live on earth.