Voyage to the Bottom of the Sea

Admiral Nelson proposed the nuclear missile launch because the meteor shower had created a fiery belt surrounding Earth's atmosphere, causing global temperatures to rise catastrophically. The missile was intended to 'amputate' the inferno from orbit by dispersing the flames in the Van Allen Belt, which was the only way to stop the chain reaction of fires consuming the planet.

Earlier in the film, Nelson disputes Zucco's predictions about when the flames would naturally burn out, showing his belief that action was necessary.

Dr. Hiller was secretly aligned with Chief Scientist Emilio Zucco's position that the fires would eventually extinguish themselves. She sabotaged the Seaview because she believed Nelson's mission would fail and potentially make things worse. Her radiation badge revealed she had been exposed to dangerous levels of radiation while attempting to sabotage the nuclear reactor core, which confirmed her motive to stop the mission at any cost.

Hiller was noted to be secretly aligned with Zucco's stance, though this was not immediately apparent to the crew.

A meteor shower set off apocalyptic fires across the globe. The meteor shower triggered a chain reaction that drastically raised global temperatures, creating a fiery belt in the atmosphere that threatened to consume the entire planet.

The catastrophic ice fracture and the crew's emergence into a burning sky are the first visible signs of this crisis.

Captain Crane granted crew members the option to abandon ship because frustration among the crew had mounted to the point of threatening a mutiny. With the main generator sabotaged, the submarine forced to navigate a perilous World War II minefield without radar or sonar, and the mission seeming impossible, Crane and Nelson made the decisive choice to offer dissenters a way out rather than risk open rebellion.

The timeline shows crew frustration building alongside the series of obstacles they faced.

Miguel Alvarez, the scientist rescued from Ice Floe Delta, became convinced he was divinely chosen to destroy Earth. His belief in divine intervention drove him mad, leading him to threaten the crew with a bomb. This psychological break occurred during the intense mission pressure and escalating global crisis.

Alvarez was initially introduced as a fervent believer in divine intervention, which foreshadowed his later breakdown.

The hostile submarine gave chase into the Mariana Trench, but it was destroyed by the immense pressure of the deep ocean depths. The submarine imploded before it could attack the Seaview, eliminating the threat without the crew needing to engage in combat.

The Mariana Trench is established as an extremely deep and dangerous location earlier in the timeline.

Chief Scientist Emilio Zucco opposed Nelson's plan because he believed the flames would eventually extinguish themselves naturally. Zucco was convinced that the global fires would burn out on their own without the need for a risky nuclear intervention. He presented this viewpoint to the United Nations Scientific Committee and directly disputed with Nelson about inaccurate predictions regarding the burn-out point.

Zucco's opposition is introduced early when he stands firmly against the proposal at the UN meeting.

Captain Crane ordered the launch of a nuclear missile from outside the submarine, directing it toward the hazardous Van Allen Belt. The explosion successfully dispersed the flames that were threatening Earth's atmosphere, neutralizing the fiery belt and averting disaster. This validated Nelson's original plan and proved Zucco's wait-and-see approach would have been too slow.

The film builds to this climax after the crew overcomes all obstacles and reaches the Mariana Islands.

The Seaview was conducting crucial trials in the frigid Arctic waters and was directed by Admiral Harriman Nelson to maintain radio silence for a full 96 hours. This isolation was critical to the trials' success, but it meant the crew was completely unaware of the catastrophic meteor shower and global fire crisis unfolding above them while they were submerged.

This decision directly led to the crew's shocking discovery when they finally surfaced.

The hostile submarine was not built to withstand the extreme pressure at the depths of the Mariana Trench. When it pursued the Seaview into those depths, the water pressure became too great for its hull to withstand, causing it to implode and be destroyed before it could attack.

The Mariana Trench is established as an environment of immense pressure and danger.

The Seaview needed to reach the Mariana Trench because the launch position above the Mariana Islands required specific angles and trajectories that were essential for the nuclear missile to effectively reach and neutralize the fiery belt in the atmosphere. The location was critical to the mission's success, making the race against time to reach this position a central challenge.

The timeline emphasizes the urgency of reaching optimal launch position as a life-or-death decision.

The Seaview attempted to contact the President via the Rio-to-London telephone cable but only managed to access the London cable because contact with the U.S. had been severed for 35 hours. This communication failure added to the isolation and urgency of their mission.

The failed communication attempt occurs during the conflict with the giant squid.