Why isn't there an inner-space race to match the outer-space one ?

The only thing you need to remember about the history of nuclear power is this:
“ Nature ( e.g. us humans ) is very good at locating exploitable energy;
but ( as it turns out ) nuclear energy wasn't very exploitable. ”.

The deeper you dig the hotter and denser it gets ( more exploitable );
so why isn't there an inner-space race to match the outer-space one ?

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