"Parking brake installed, not in use." That might have been the situation involving an SUV that fell 700 feet into Big Horn Canyon near the Bighorn Canyon National Recreation Area.

It doesn't get much publicity, but some of the most interesting scuba diving in the U.S. takes place in our national parks. So grab your fins, masks, snorkels and regulators and have a go at this week's quiz. Answers are at the end. If we catch you peeking, we’ll put sand in your wetsuit.