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.

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.

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.

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.