Underwater worlds with a touch of necromancy

Necromancy is a weirdly niche kind of magic to love, but it's my weirdly niche kind of magic. I'm a sucker for necromancy stories, so a creepy corporation running 'revivals' for profit whilst protecting a dark secret? Tell me more. Add to that the terrifying atmosphere of a world underwater (I'm scared of deep rockpools, let alone deep sea diving, ok) and I'm obsessed. Definitely need to read more of this one to find out what is going on in Palindromena's basement, and what secret Tempest is going to find out by reviving her dead sister. From the blurb, it looks like it's going to be a touch of zombie-with-unfinished-business on the run too, and after Undead Girl Gang, I'm all about that.