Obviously, motherload comes to mind.
What surprised me though, was that this game was, in my opinion, a significant downgrade from motherload. Here's the 5 biggest differences:
1. Fog where you haven't explored and radar with it, rather annoying as it takes 4 hours to drill about idly to get everything.
2. Coolant system was heavily required and didnt get you too far, also the incline on price was ridiculous (in my opinion anyways)
3. Physics and graphics were lower-grade.
4. You can drill upwards
5. No earthquakes, meaning limited resources.
Overall, not bad, but not dazzling either, obviously a lot of effort went into this regardless, but to me at least, it feels somewhat redundant.
Also, TheRandomDot, Fuel meter isn't reading low for no reason, "low fuel" is entirely relative to your depth, as lower = more fuel needed to reach the surface.
Once again, been-done concept, fairly good execution, but only a few differences at the core level.
8/10, 4/5 ~WCCC