Picking golf balls

Every few years, a company comes in and drags the ponds on the golf course for golf balls that have been lost to the depths. The have a couple of utility vehicles with a winch system rigged up. They use the winch to pull a ball picker back and forth between them. They collect all of the balls and clean them. They then send us a portion of those balls that they recover. Here is a video of them dragging #17.