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Captain Sonny Jennings and his core team of lifeguards monitor the dangerous Hawaiian waters; new lifeguard recruits compete to join Sonny’s district; Sonny and his family grieve after the loss of his nephew; Em reveals a romantic past with Will.

A flash flood sweeps a young tourist away from her family and out to deep sea; going against Sonny’s wishes, Em takes a bold risk and places her own life in danger in hopes of rescuing the lost -at-sea tourist.

Em works to earn the team's respect when she is left in charge and Hina and Kainalu juggle multiple beachside emergencies; Will's fiancee pays him a visit at work; Sonny opens up to a former lifeguard about his trauma since losing his nephew.

College kids get trapped in a collapsed sandpit; Sonny, Will and Laka race to rescue people stranded after a shark attack; Will learns if he made the cut for the firefighter job he has been pursuing.

The lifeguards of the North Shore experience the most dangerous ocean conditions the district has seen in years; Sonny assigns Laka as acting lieutenant; Kainalu's father pressures him to leave his shift and help him with his campaign.

The North Shore community comes together for Rocky's paddle out; Hina thinks about switching districts; Laka, Will and Kainalu try to save a beachgoer that accidentally speared his own foot; romance heats up between Sean and Em.

An influencer gets swept into the ocean while trying to film a new video; Kainalu and Hina discuss setting boundaries within their home; Mayor Emerson makes good on his word with Captain Sonny; Jenn finally agrees to go on a date with Laka.

Sonny, Em, Will and Laka look for missing paragliders that were pushed into the ocean by a down draft; Kainalu invites Hina to a party with his ex-girlfriend; Jenn doesn't think Laka is serious enough for her; Sonny puts in his notice to retire.

Christmas cheer is in the air as the lifeguards prepare for their annual holiday toy drive; while surfing, a local grandpa has a heart attack and is rushed to the hospital; Sonny tells Laka he is not ready to become a lieutenant.

The team races to the rescue in the aftermath of an ATV accident; romantic tensions are high between Em and Will as well as Kainalu and Hina.

Em and Will's relationship struggles as they navigate the return of his fiancée; Kainalu asks Laka for help; the team races to rescue a group of locals involved in a serious accident while riding an inflatable Supsquatch.

The team is on high-alert when a tsunami advisory is sent out following an earthquake. As the state of Hawaii is under an evacuation order, Captain Sonny has bigger issues when Ocean skips school and he can't find her.

Captain Sonny and the Ocean Safety team face their most dangerous rescue yet when a literal minefield is discovered on the ocean floor. Meanwhile, on the beach, a hugely popular influencer will do anything to capture viral content for her massive following.

The team races to rescue unresponsive cliff jumpers; Hina tries to navigate family issues; Will and Em hope to get over each other by rebounding with other people.

The team searches for two missing teenagers that ditched school and find themselves stranded in the middle of the ocean, after they realize they stole a cracked canoe. Meanwhile, Will does not get along with District 7's new team member. Em receives a surprise visit from her estranged mother.

Em takes the day off to spend time with her mom, but races into action when she comes across an unresponsive cave diver; Will confides in Vince about his personal anger issues; Laka searches for a missing local.

Will and Em race to rescue a windsurfer that wipes out and suffers cardiac arrest; Capt. Sonny reunites with Ocean over a family lunch and Em realizes her mom is back to her old ways; Hina tries to hide her jealousy over Kainalu's new relationship.

While monitoring the beach, Laka and Will notice a toxic smell coming from a van and discover a kid unconscious and surrounded by drug paraphernalia; Em befriends a disabled veteran; Hina finally confesses her feelings to Kainalu.

Hina and Kainalu assist the US Coast Guard in searching for two missing snorkelers left behind in the middle of the Ocean. Meanwhile, Captain Sonny takes matters into his own hands about Vince. Will and Julie meet for coffee and Em receives a job offer from a very rich person. Laka and the team attend Ocean's graduation party.