The Deep was classified as a habitable ocean world by long-range survey probes.
The planet was approved for colonization shortly afterward.
The original survey data remains heavily restricted.
Most colonists never see the full reports.
The Deep may never have been selected for colonization at all.
Someone chose this world for another reason.
The settlers were simply expendable labor.
Millions of people have been sacrificed to search for something hidden beneath the ocean floor.