Sean and Leigh investigate a new man made reef that might be a secret toxic dump. Zack loses Brian’s prized paddle, so he and Jason must go through a series of embarrassing trials to get him another.
Sean and Leigh are in the scarab off of Maui investigating a new man-made reef that is being put in to lure additional tourists. Neither of them is happy with this new development because it has caused a shift in the rip patterns. NICK, a surfer, is also concerned and, for some reason, isn’t feeling quite well. His brother JOE is surfing and tombstones. Sean and Leigh quickly jump into action and bring Joe to the beach. He is unconscious and Nick is nearly hysterical. Sean and Leigh try to get him to wait for the ambulance, but he’s too caught up in trying to save his brother. The ambulance ar-rives and Nick hops in to go to the hospital.
In the hospital, Joe is fine but Nick turns out to have pneumonia. Sean and Leigh begin to suspect that there is something wrong with the materials that are being used to create the new reef. To complicate matters, Sam Parks has come back. Sean definitely does not trust Sam, and Leigh is loathe to tell him the truth about Sam’s status as a Navy Intelligence officer. Because she and Sam are getting serious, the Navy has requested that Leigh get a security clearance. Remembering what happened after her father died, and all the red tape she and her mother had to go through, Leigh is hesitant about get-ting the clearance and begins to doubt her relationship to Sam. To make matters worse, Sam warns she and Sean to stop snooping around the artificial reef. Sean and Leigh, though, know that something is up, so they take a look at the material being used to create the reef. Sure enough, the containers, labeled “Black Construction,” are leak-ing. They go to visit “Black Construction” and learn, from its nervous owner, that they only supply the empty containers. The containers themselves are delivered to “Vaughn International.” They sneak into a warehouse to examine one of the containers. Unbe-knownst to them, Sam is investigating Vaughn and is scheduled to meet him that even-ing. Sam heads for the meeting. Back at Vaughn International, both Sean and Leigh are bashed on the back of the head by VAUGHN, the evil owner of the corporation.
Before Sean and Leigh know what has happened, they are chained inside a “cleaning chamber” used to wash out the containers. The room is slowly being filled with sea water. Vaughn tells them that they were correct: he is dumping toxins into the water and there is no way anyone will ever catch him-particularly since the two of them will be victims of an unfortunate drowning accident. With that, he leaves.
The water keeps pouring in. Sean sees that the chains that bind them are old and weak. He starts trying to break them, but to no avail. He and Leigh talk about Sam-Sean is shocked to learn the truth about his status as Navy Intel. The water rises further. Their sense of doom is increasing. Sean wants Leigh to keep fighting, but the cold of the water is causing her to go into hypothermia, and the water is rising to their necks.
Sam, meanwhile, is worried because Vaughn has not shown up for his meeting. He heads for the factory. Sensing doom is near, Sean and Leigh finally give in to their feelings for each other and share a furtive kiss. This sparks Sean into diving under to continue trying to break the chain loose. They hear someone knocking on the outside. It is Sam. He opens the top to the cleaning chamber just as Sean succeeds in breaking the chain holding Leigh. Sam brings her to the safety. Sean can no longer get a breath-the water has risen too high. Sam dives down, armed with a hammer, and suc-ceeds in breaking Sean’s chain. He and Leigh work frantically to bring the unconscious Sean back. Finally, he sputters and comes to. It turns out that Sam has been investi-gating Vaughn International for some time. Sean and Leigh realize they should not have interfered at the level they did, but also know that had they known the truth, they would have probably done the same thing. Sean ultimately decides that Sam is a good guy after all, and he should let Leigh find her happiness with him.
Meanwhile, Zack is in trouble: he had taken Brian’s paddle out of his car to try it out…and then had broken it! He enlists Jason’s help in getting Brian a new one. At first, Jason doesn’t want to betray Brian, but knows how much trouble Zack will be in if he doesn’t help. The two go to Auntie Jackson, who knows where they can get a similar paddle-the only problem is that it is custom made and costs $750. However, if Zack and Jason are willing to help her, she can get the price knocked down by half. The two need to perform in grass skirts in front of some women, and then listen to a local moke who likes show tunes. In the end, it turns out that Brian knew they lost his paddle and was just trying to teach them a lesson. It doesn’t matter-he likes the new one they had to get him, especially since his old one was just a run of the mill one from the local sporting goods store.