Ogata and Emiko visit Serizawa to ask that they use the weapon against Godzilla. Serizawa refuses and storms down to his basement to destroy the Oxygen Destroyer. Ogata and Emiko follow him down in order to prevent him from doing so. However, this only results in a short fight between Ogata and Serizawa, with Ogata receiving a minor head wound. As Emiko treats the wound, Serizawa apologizes. Ogata tries to convince Serizawa that he is the only one who can save the world.
Then, after the argument, a grim television program appears on the air, showing the devastation and deaths caused by Godzilla, along with prayers for hope and peace. Shocked by what he's witnessing, Serizawa ultimately decides to use his last Oxygen Destroyer, but only one time. Serizawa then ultimately destroys his research, knowing that this weapon was almost as dangerous and destructive as Godzilla himself, and that destroying this weapon will be for the better of society.
The next day, a navy ship takes Ogata and Serizawa to plant the device in Tokyo Bay. Serizawa requests that he be put in a diving suit to make sure the device is used correctly. Ogata at first refuses, but soon gives in. Ogata and Serizawa then descend into the water, and find Godzilla resting. Seemingly unaware of the divers, the monster slowly walks around the ocean floor. Ogata then is pulled back to the surface while Serizawa activates the Oxygen Destoyer. As Serizawa watches Godzilla dying from the destructive weapon, he cuts his cord and dies with Godzilla, sacrificing himself so that his knowledge of the horrible weapon dies with him. A dying Godzilla surfaces, lets out a final roar, and sinks to the bottom, disintegrating.
Although Godzilla is destroyed, the tone is still grim. As the people aboard the ship look to the sun, it is uncertain whether the death of Godzilla is either the end or the beginning of an apocalyptic era.
“Always do right. This will gratify some people and astonish the rest.” - Mark Twain