Assuming you have a rock bore well, the blasting could have caused a cave in.
You could find someone with a camera to see what the blockage is but, putting the pump lower probably isn't going to solve the problem. It sounds as if the well wasn't developed or if it was, not good enough. Call the driller and see what they say about that.
Take that bottle and pour it through a coffee filter and see if the water clears up or how much it clears.