Matt and Slade go surfing and the one who falls first backs off and lets the other one have Summer. Matt falls first, but his board falls into a cave. An octopus lives in the cave and it takes care of the board. Matt and Slade tell Mitch about it and he tells them about the cave. The cave is said to be a surfboard cemetery and Ben visited the cave once. When Mitch has told them that, Matt and Slade decide to explore the cave and Summer agrees to go with them.
This long-running series follows the adventures of a team of lifeguards on the crowded beaches of Los Angeles County. Veteran lifeguard Mitch Buchannon watches over the younger lifeguards that come and go with each passing season as they keep the beaches safe for vacationers. Frequently he must take action to save them from the raging seas and from the raging tempers that sometimes flare up between the young guards in this stressful job.