You keep repeating this over and over as if it is some sort of argument. The answer is simple: send them home.
Don't tell me it can't be done. I am sure the drivers of the first skiploaders that pulled up to the WTC remains after 9/11 saw a mountain that "couldn't be cleaned up."
But the frst bucket was filled. And thus the task was begun. After a lot of time and effort, eventually the entire thing was cleared out.
That is how yo do ANY difficult task. It starts with a will, then it gets executed, no MATTER HOW HARD.
Your screen name is fitting.