Adds a new "deep ocean trench" tile to Aquilo, appearing between resource islands. This tile cannot be covered with ice platforms, landfill, or foundation. So you can't move resources around on Aquilo using belts or trains. You'll need to use Cargo Ships or some other modded means of shipping (like long-range delivery drones or teleportation).

See image above for example world gen. There's a no-trench area around the starting island, for building your main base, and there's a no-trench region around each resource island, for building ports and a local subfactory.