Tunnel (2016) Timeline Explained – Every Event in Order

Se-hyun signed the agreement under intense public pressure after an excavation worker died in an accident. The media scrutiny and criticism from the public, including her own mother blaming her, created unbearable emotional toll. The agreement would allow construction of the Second Hado Tunnel to resume, effectively ending the rescue operation for her husband.

Foreshadowing: The public sentiment had already turned against the rescue by Day 5, with many questioning why so many resources were spent on one person.

• se-hyun
• agreement
• rescue halt
• public pressure
• tunnel construction

In the final attempt, Dae-kyung descended through the drill hole using a sound detector to pinpoint Jung-soo's location. Simultaneously, Jung-soo crawled toward Mi-na's car and honked the horn to create a clearer sound signal. The team then used explosives planned for the Second Hado Tunnel, and the vibrations helped rescuers push through the debris to reach him after 35 days.

Foreshadowing: Earlier, the team had used the #3 ventilation fan marker to coordinate their efforts, establishing a reference point for locating Jung-soo.

• jung-soo
• rescue
• sound detector
• horn
• location
• 35 days

Mi-na was found impaled by a steel rebar, seriously injured but alive. Jung-soo kept her company and assured her that help was coming. Despite his efforts to keep her spirits up, Mi-na died from her injuries on Day 4, which became a devastating setback for the rescue team and deepened Jung-soo's despair.

Foreshadowing: The discovery of Mi-na's dog on Day 3 initially brought hope, signaling that another survivor was nearby.

• mi-na
• survivor
• rebar
• death
• trapped

The rescue faced multiple severe obstacles: the tunnel schematics were improperly mapped, forcing a complete restart of the excavation plan; the tunnel kept shifting and collapsing, threatening to bury workers; an excavation worker died in an accident; and public opinion turned hostile against the effort. These factors combined to extend what should have been a faster rescue into a 35-day ordeal.

Foreshadowing: From the beginning, Dae-kyung warned that every second mattered, but the unstable tunnel conditions constantly threatened the operation.

• delays
• tunnel collapse
• schematics
• worker death
• public opinion

When the tunnel vibrated, the number 3 on a ventilation fan became visible. Rescue chief Dae-kyung used this #3 marker as a coordinate to direct both the excavation through the tunnel and the drilling from above. This reference point became crucial for coordinating the two separate rescue approaches toward Jung-soo's location.

Foreshadowing: Early in the rescue, the team struggled to pinpoint Jung-soo's exact position in the darkness.

• ventilation fan
• marker
• excavation
• drilling
• coordinates

The newly opened Hado Tunnel collapsed around Jung-soo while he was driving back toward Seoul. The collapse created a massive pile of concrete and steel, trapping his car beneath rubble. The tunnel remained unstable throughout the rescue, continuing to shift and cave in, threatening both Jung-soo and the rescue workers.

Foreshadowing: The collapse occurred without warning while Jung-soo was simply driving home with a birthday cake.

• tunnel collapse
• hadeo tunnel
• rubble
• trapped

As the rescue extended for days, public opinion shifted negatively. People questioned why so many resources, money, and time were being spent on one trapped man. The death of an excavation worker further fueled criticism. This mounting pressure eventually led to Se-hyun being pressured into signing the agreement to halt the rescue and proceed with building the Second Hado Tunnel.

Foreshadowing: From the start, the media treated Jung-soo's situation as a dramatic story for ratings rather than a humanitarian crisis.

• public opinion
• media
• criticism
• resources
• worker death

Jung-soo survived through strict rationing of limited supplies. Dae-kyung instructed him to conserve his phone battery and ration just two water bottles and a birthday cake meant for his daughter's birthday. This careful management, combined with his determination to survive for his family, allowed him to endure until rescue arrived.

Foreshadowing: Dae-kyung emphasized from the first call that careful resource management was essential for survival.

• jung-soo
• survival
• water
• cake
• rationing
• 35 days

After successfully rescuing Jung-soo, Dae-kyung was reassigned to a desk job, moving away from frontline rescue work. Despite his exhaustion and the personal toll of the 35-day ordeal, he remained protective of Jung-soo, even shielding him from media frenzy with a profanity-filled outburst toward journalists.

Foreshadowing: Dae-kyung had initially interrupted news crews, reminding them that a life was at stake, not ratings.

• kim dae-kyung
• desk job
• rescue chief
• reassignment

The birthday cake was intended for Jung-soo's daughter Su-jin, making it both a literal and symbolic resource. Dae-kyung included it in the rationing plan - two water bottles and the cake - to stretch supplies over time. The cake represented Jung-soo's connection to his family and his will to survive, becoming a psychological anchor during his ordeal.

Foreshadowing: Jung-soo was driving back toward Seoul when the tunnel collapsed, specifically to deliver the cake for his daughter's birthday.

• birthday cake
• su-jin
• daughter
• rationing
• family