Cave diving expert on the risks Thai boys faced during rescue Sandra Clopp is a diving instructor with nearly 20 years of experience. She has cave dived all around the world including Mexico and the Philippines. Clopp joins "CBS This Morning" to show some of the diving equipment rescuers used to save the soccer team and coach who were trapped in a Thailand cave for more than two weeks and discuss the psychological stress of the underwater rescue for inexperienced divers like them.