There was a science fiction short story about that. I don't remember the name, but they used it as a prison. A perpetual pendulum of swinging prisoners...
"A perpetual pendulum of swinging prisoners..."
You gotta admit, it would be one hell of a bunjee ride. So long as you don't meet someone midway coming from the opposite side.
Someone else thought of selling "hole fares" across the planet, since the trip would only be 18 minutes or so.