Senior Chief Petty Officer Ben Randall is the top
rescue swimmer at the
United States Coast Guard's
Aviation Survival Technician (AST) program, but the long hours have destroyed his marriage. When on a rescue, Ben loses his team in a
HH-60J Jayhawk helicopter crash at sea. While waiting in a survival raft, his best friend,
Chief Petty Officer Carl Billings, dies. Shaken by
survivor guilt, Ben is transferred to become an instructor at the Coast Guard AST training school in Louisiana, where he develops a legendary reputation among the students for his high number of rescues. One student is hot-shot candidate Jake Fischer, a top high school competitive swimmer who rejected scholarships to every
Ivy League college to enlist in the Coast Guard. During training, Jake meets local school teacher, Emily Thomas, and they begin a casual relationship. The initial weeks of training end with most of the students dropping out and advanced instruction begins. One day, Jake arrives late, and Ben punishes his entire class for his tardiness. Believing Jake to be lazy and unmotivated, Ben tries to force him to quit, but gradually begins to see Jake's persistence and dedication. Jake meets Emily in a bar and tells her about beating Ben's old records. The bartender, a friend of Ben's, tells Jake about a time when Ben injured himself saving every victim from a burning
hospital ship full of invalid patients. Later, a friend of Jake's fears failing school because he is unable to cope with panicked victims in the water. Jake takes him out for a drink at a
Navy bar to cheer him up, but they get in a fight with a group of seamen and are arrested, causing Jake to miss a date with Emily. Chief AST Jack Skinner bails the pair out, and Jake takes the blame for the fight. Back on base, Ben and Jake get into a confrontation about their pasts; it is revealed that in high school, Jake survived a car crash that killed the rest of his swim team, which he blames himself for despite having been sober. They bond over their experiences as sole survivors and return to the bar, where Ben defeats a seaman harassing them, forcing the rest to stand down. At graduation, only a handful of candidates remain. Jake has emerged as a leader during training. Emily attends his graduation, but they end their relationship because Jake is leaving for an assignment at
CG Air Station Kodiak,
Alaska, Ben's previous post. Ben and Jake are sent to rescue two kayakers trapped in a cave. Ben experiences flashbacks so Jake must guide him, but the rescue is eventually successful; however, the experience prompts Ben to retire. Before he leaves, Ben tells Jake that the only record he kept track of was the 22 people he lost during his career. Ben visits his wife to apologize and indicate he will not contest the divorce. Jake is sent to rescue the crew of a sinking
fishing trawler, but he becomes trapped in the hold trying to save the captain, who is killed by debris. His helicopter is forced to return to base, where Ben hears of the situation and decides to suit up and rescue Jake personally. He frees Jake, but as they are winched upwards towards the helicopter, their combined weight causes the winch cable to begin separating. Knowing it will break, Ben unclips himself so Jake can survive. Jake catches him, but Ben removes his glove and slips free, plummeting to his death. Much later, Jake is on a rescue mission, when one of the survivors repeats the legend of the Guardian to him, which he connects to Ben. He then surprises Emily while she is teaching a class, and the two reconnect. ==Cast==