This story is erotten in two different POV. One of the characters,  Miri, I could give 2 shits about. Dull, lifeless, whiny and boring. Yea if my spouse went MIA for 5 months in a deep sea exploration is be freaking out too. But still. 

Leah, on the other had was the spouse on the dive. We did not have nearly enough time with her characters and her experience under the sea. 

And then the monster reveal. Really?  That's it?  Still not sure what happened to Leah in the aftermath of the dive had anything to do with the monster.

This book was 228 pages long and it took me a week to read. If it wouldn't have been for Leah i would not have finished.