I was hoping someone with a PHD in some sort of science would be able to explain the logistics necessary to dig through the crust/mantle.
Since it's thin in perspective, then we'll move onto the next layer of the Earth, the mantle.
Bungie helps the community, right? And the Ninjas could be actual Ninjas in the FludHub, so they would most likely help towards this cause.
We could also traffic bacon and toast across the world if we [i]really[/i] need money (as in, we borrowed from more than one gang/mob, and they want payment as soon as the tunnels are up, or else legs are going to be broken).