The Seafloor Cavern is the slumbering place of Groudon and Kyogre.
- Teams Aqua and Magma break off their alliance
- Team Aqua wakes up Kyogre and Team Magma wakes up Groudon
- Maxie uses the Jewels to control Groudon and Kyogre
- Amber steals the Blue Jewel from Mitch, delivering it to Archie
- Archie betrays Amber and dooms him and Mitch to near-certain death
- Ruby and Sapphire battle Archie and Maxie
- Archie and Maxie are completely taken over by the Jewels, absorbing them into their bodies
- Kyogre and Groudon call out to the Blue and Red Jewels, resulting in transporting everyone in the Seafloor Cavern to Sootopolis
- The Seafloor Cavern collapses
DescriptionLocated at the very bottom of Hoenn's seas, the Seafloor Cavern is only accessible through a submarine with a special component from Devon or on a Relicanth. At its entrance, there is a forked path. One path leads to Groudon, and the other to Kyogre.
- In some translations, the Seafloor Cavern is mistakenly called the "Cave of Origin"
- After their first battle, Kyogre and Groudon came here to slumber; after their second battle finishes and the Jewels are destroyed, Kyogre returns to the collapsed Seafloor Cavern, but Groudon goes to Mt. Chimney
- Prior to the opening of the RS Arc, Steven Stone and his father had intended to use the Kaien I to collapse the entrance into the Seafloor Cavern, therefore ensuring that Teams Aqua and Magma could not reach Kyogre and Groudon