You hit a temperature/pressure threshold pretty quickly once you start going down.
It's hard to engineer materials or machinery that can cope with the kind of pressures and temperatures created when drilling deeper than a few kilometres.
Also pouring government funds into something like this is not as glamourous as manned space flight missions. A good example is that we know more about the surface of the Moon than we know about the ecosystems in the Mariana trench.
It's hard to engineer materials or machinery that can cope with the kind of pressures and temperatures created when drilling deeper than a few kilometres.
Also pouring government funds into something like this is not as glamourous as manned space flight missions. A good example is that we know more about the surface of the Moon than we know about the ecosystems in the Mariana trench.