Chernobyl: Abyss (2021) Timeline Explained – Every Event in Order

Alexey agrees to join the reservoir-drain mission for two reasons: first, to prevent a secondary steam explosion that could blanket Europe with radioactive material; second, and more personally, because he learns his son has been exposed to radiation and is dying. He negotiates that his son will be sent to Switzerland for treatment in exchange for his participation.

Foreshadowing: Earlier, Alexey applies for a transfer to Kyiv seeking a fresh start, but the explosion pulls him back into duty.

• Alexey Karpushin
• reservoir mission
• Chernobyl
• radiation
• son
• motivation

Experts warned that the melting reactor core could cause a massive steam explosion in the reservoir beneath Reactor 4. This reservoir held an enormous amount of water used for cooling. If the superheated core contacted the water, it would trigger an explosion capable of releasing radioactive material directly into the upper atmosphere, multiplying the disaster across Europe.

Foreshadowing: The timeline notes experts warn of a potential secondary steam explosion as the situation unfolds.

• secondary explosion
• steam explosion
• reactor 4
• reservoir
• radioactive plume

During the second attempt to drain the reservoir, Valera becomes trapped in the mechanism. To allow Alexey to escape to safety, Valera cuts the connecting rig, freeing Alexey but trapping himself permanently. He makes this sacrifice so that at least one of them might survive.

Foreshadowing: The first attempt already failed, raising the stakes and showing the mission's deadly risk.

• Valera
• sacrifice
• reservoir
• second attempt
• trapped

Alexey is chosen because of his specific experience inspecting corridors under nuclear reactors. His technical knowledge of the underground passages beneath the reactor makes him one of the few people qualified to navigate the dangerous environment and manually operate the drainage system.

Foreshadowing: The timeline references his experience inspecting corridors under nuclear reactors when the danger beneath becomes apparent.

• Alexey Karpushin
• corridor experience
• nuclear reactor
• selected
• qualification

The first attempt to drain the reservoir ends in failure. The team faces technical difficulties and cannot successfully complete the drainage operation. With the clock ticking and the risk of a catastrophic explosion increasing, they are forced to regroup and prepare for a second, even more dangerous attempt.

Foreshadowing: The failed first attempt raises the tension and shows the deadly difficulty of the mission.

• first attempt
• failed
• reservoir
• drainage
• mission

Olga visits Alexey in the hospital despite their earlier conflict, where she had told him never to visit again after he missed their picnic. Her visit represents forgiveness and reconciliation, as she embraces him in his final moments, acknowledging his sacrifice and the love that still exists between them.

Foreshadowing: Their earlier conflict and Olga's ultimatum about never visiting again sets up the emotional weight of this reunion.

• Olga Savostina
• hospital
• reunion
• forgiveness
• final moments

Alexey dies from severe radiation exposure. After successfully completing the reservoir drainage mission, his body is found severely irradiated. He is taken to the hospital where his condition deteriorates, and he dies shortly after Olga embraces him one last time.

Foreshadowing: His severe radiation exposure is revealed as he crawls to safety after the mission.

• Alexey Karpushin
• radiation poisoning
• death
• hospital
• cause of death

Alexey's son was exposed to radiation and faced a perilous fate. As part of Alexey's conditional agreement to join the mission, his son is sent to Switzerland for treatment. Three months after the disaster, the son returns home alive, providing a bittersweet closure to the story as his father's sacrifice ultimately saved his life.

Foreshadowing: Alexey agrees to the mission specifically on the condition that his son receives treatment in Switzerland.

• son
• radiation exposure
• Switzerland
• treatment
• survival
• returns home

Alexey misses the planned picnic because he was pursuing a transfer to Kyiv, seeking a fresh start from his past life. His failure to show up for the picnic leads Olga to tell him never to visit again, creating the emotional conflict that drives much of the personal stakes in the story.

Foreshadowing: This rupture in their relationship occurs early and foreshadows the separation between his personal life and his professional duty.

• missed picnic
• Olga
• son
• argument
• transfer
• Kyiv

The reservoir mission was a manual operation to drain the massive water reservoir beneath the melting Reactor 4. With the reactor core overheating and potentially causing a catastrophic steam explosion, divers needed to manually open the drainage valves in the flooded corridors. This was considered a probable suicide mission due to the extreme radiation levels.

Foreshadowing: The warning of a greater catastrophe from the reservoir sets up the necessity of this dangerous operation.

• reservoir
• drainage mission
• Reactor 4
• manual operation
• steam explosion
• valves