- A region of the deep sea was found to have an unexplained pocket of oxygen with no solid barrier above it. It's as large as a country.
- To enter the undersea realm, humanity uses dropships akin to those in Megaman Legends. A high downward velocity is necessary to break into the oxygen pocket.
- It is later discovered that Earth has a "secondary core" beneath this underseq realm, which produces a newfound gravity equivalent, one which only affects certain materials. Materials imbued with this secondary gravity end up canceling the effects of the original gravity.
    - Perhaps superheated materials (like lava) are more affected
    - The retaining barrier of oxygen is imbued with this second gravity
- After months or years of analyzing second gravity and its implications, it is discovered that a huge space anomaly is approaching Earth, drawn to its growing secondary core