 Rhiannon Alley reporting. Dramatic moments at San Diego's Mission Beach Tuesday. Rescue crews say the 16-year-old was digging a six to eight foot hole in the sand when it collapsed, trapping her neck deep. Rescuers dug for about 15 minutes before they were able to lift her out of the sand. This is lifeguard Jacob Magnus. At least once or twice a year, there's some kind of similar event where a child or a person is in a deep hole on the beach and then it starts to cave in or collapse.