While you wait for Subnautica 2, here's a moody Bioshock-esque strategy game in which you can put Big Daddies on crabs

As Subnautica 2's early access launch approaches, my mind inevitably drifts to videogames that explore the pleasures and horrors of the deep blue. Tides of Tethys is one for the Jules Verne fans amongst you, with perhaps a pinch of Warhammer 40,000. It's an underwater strategy roguelite with city-building elements in which you guide troupes of bathynauts around procedurally generated ocean floors. You'll need to expand your modular outposts, ensuring your Knights have oxygen and power and food, while dealing with increasingly unfriendly aquatic beasties. I thought the giant crustacean I slew in the just-updated demo was an unfriendly beastie, but then I got a Steam Achievement for killing a harmless creature. I do hope this won't have ramifications. I hope that giant crustacean doesn't have a mother. Hang on, it looks like I can turn crustaceans into valiant steeds! Don't eat me, crab mum - I promise I will be nicer to invertebrates in future.