A tale of naval diving friends navigating rivalry, romance, and a life-threatening deep sea salvage mission.
Story Structure — 4 Plot Phases
Elite Diver Dynamics
Lee and Kim are introduced as friends in an elite navy diving squad with contrasting work ethics. Their professional bond is established alongside their differing attitudes toward military duty.
Key Events
Elite Squad Introduction — Lee and Kim are introduced as friends in an elite navy diving squad. Characters: Lee Tae-hyeon, Kim JunLocation: South Korean Navy Base
Divergent Personalities — Lee takes duties seriously while Kim treats the Navy as a lark. Characters: Lee Tae-hyeon, Kim JunLocation: Training Grounds
Kang's Unit Transfer — Kang, a diving instructor and Kim's former girlfriend, is posted to the unit. Characters: Kang Su-jin, Lee Tae-hyeon, Kim JunLocation: Unit Headquarters
Rivalry and Romance
Kang's arrival as a diving instructor and Kim's ex-girlfriend sparks a love triangle. Lee's promotion over Kim deepens their professional rivalry, creating friction within the unit.
Key Events
Affection Competition — Tension rises as Lee and Kim compete for Kang's affections. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Unit Mess Hall
Promotion Conflict — Lee is promoted ahead of Kim, intensifying their rivalry. Characters: Lee Tae-hyeon, Kim JunLocation: Command Office
Catastrophe at Sea
A sudden maritime incident causes a submarine to sink, forcing the unit into emergency mode. The team prepares for a high-stakes salvage operation under extreme pressure.
Key Events
Kim's Reckless Diving — Kim's gung-ho approach to diving creates friction within the team. Characters: Kim Jun, Lee Tae-hyeonLocation: Diving Pool
Danger to Teammates — Kim's dangerous diving style poses a direct threat to his fellow divers. Characters: Kim Jun, Lee Tae-hyeonLocation: Training Waters
Escalating Tension — Personal and professional tensions reach a breaking point among the trio. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Unit Dormitory
Sudden Sea Incident — A sudden incident at sea triggers a catastrophic event. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Open Ocean
Submarine Sinking — A navy submarine sinks, requiring immediate emergency response. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Deep Sea
Deep Sea Salvage
The divers descend into the wreck, facing structural collapses and equipment failures. Lee and Kim must overcome their rivalry to execute a synchronized rescue and survive.
Key Events
Mission Briefing — The unit is ordered to attempt a dangerous salvage rescue of the sunken vessel. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Naval Command Center
Gear Preparation — Divers meticulously prepare specialized gear for the deep sea operation. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Diving Bay
Descent Begins — The salvage team descends into the treacherous depths. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Ocean Surface
Navigating Debris — The team maneuvers through underwater wreckage to reach the hull. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Sunken Submarine Exterior
Hull Breach Discovery — Divers locate a critical breach in the submarine's structure. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Submarine Interior
Internal Crisis — A sudden structural collapse traps part of the salvage team inside. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Submarine Compartment
Rivalry Set Aside — Lee and Kim must overcome their personal rivalry to survive. Characters: Lee Tae-hyeon, Kim JunLocation: Submarine Corridor
Coordinated Rescue — The trio executes a synchronized plan to stabilize the sinking vessel. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Submarine Engine Room
Critical Failure — Salvage equipment malfunctions, threatening the entire mission. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Submarine Bridge
Sacrifice and Push — The divers risk their lives to secure the submarine's buoyancy. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Submarine Hull
Surface Recovery — The salvage team successfully brings the submarine to the surface. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Ocean Surface
Aftermath and Reconciliation — The friends reconcile after surviving the harrowing deep sea mission. Characters: Lee Tae-hyeon, Kim Jun, Kang Su-jinLocation: Naval Hospital
Story Breakdown
Naval Diving Setup — Introduction of the elite squad and the contrasting personalities of the two main friends.
Elite Squad Formation — Lee and Kim join the navy diving unit specializing in salvage operations.
Romantic Tension — Kang's transfer introduces a love triangle that complicates professional dynamics.
Kang's Unit Transfer — Kang arrives as a diving instructor and Kim's former girlfriend.
Affection Competition — Lee and Kim begin competing for Kang's romantic attention.
Professional Rivalry — Career advancement and reckless behavior fuel conflict between the friends.
Promotion Conflict — Lee receives a promotion over Kim, deepening their professional jealousy.
Reckless Diving Risks — Kim's dangerous approach to diving threatens team safety and trust.
Maritime Catastrophe — A sudden disaster forces the unit into emergency response mode.
Sudden Sea Incident — An unexpected event at sea triggers a chain reaction of emergencies.
Submarine Sinking — A navy vessel goes down, requiring immediate deep sea intervention.
Salvage Mission — The team prepares for and executes a high-risk underwater rescue operation.
Deep Sea Descent — Divers gear up and descend into the treacherous ocean depths.
Structural Crisis — Underwater wreckage and collapsing compartments trap the salvage team.
Climactic Rescue — The trio overcomes personal differences to stabilize the vessel and survive.
Overcoming Rivalry — Lee and Kim set aside their feud to coordinate a synchronized rescue.
Surface Recovery — The team successfully brings the submarine to the surface against odds.
Character Resolution — The aftermath of the mission brings closure and personal growth.
Friendship Rebuilt — Surviving the crisis restores trust and camaraderie between Lee and Kim.
Professional Growth — The unit emerges more cohesive and disciplined after the harrowing ordeal.
Two friends in the Korean Navy, Lee and Kim are both part of an elite diving squad, specialising in emergency deep sea salvage dives. Lee is straight-laced and takes his duties seriously, while Kim treats the Navy as a lark. When Kang, a diving instructor and Kim's former girlfriend, is posted to the unit, this creates tension between the friends as they compete for Kang's affections. The tension is heightened when Lee is promoted ahead of Kim, creating a rivalry between the two. Kim's gung-ho approach to diving, and the danger he poses for himself (and his fellow divers), leads to further problems. Matters come to a head when an incident at sea causes the sinking of a submarine, requiring the unit to attempt a dangerous salvage rescue of the sunken submarine.
