Okay, so you manage a mining crew, digging deep into the earth, deeper than anyone has ever gone, breaching the crust, the mantle and finally the core.  In the great spirit of the lovely Oregon Trail, this is a real-time game, so buckle up and start your engines.  Also, it's a MMOG, so you can see the other drill holes, even cross over them and eventually line up with someone on the opposite side of the planet creating a hole that literally traverses through the depths of the deepest and back out again.

GAME IDEA: LONG AND DEEP