Miziri

Death World
Miziri is an Ocean world, almost 100% covered in water. The only reason the Imperium deigned it worth habitating was an extreme abundance of highly radioactive metals commonly used in ship engines that sat underneath the water, preserved by the miles of liquid above them.

Scattered across the surface are a series of remote deep sea mining outposts. The total population of this planet is small, under 100k people, and few are of any importance. Every outpost would have a small contingent of Imperial guard, and a local Representative of the Ecclesiarchy and the Machine Cult.