“Full Sea” by Chang-Rae Lee. Dystopian fiction, but not sci Fi and not like any dystopian fiction I’ve ever read. It’s about a young girl who makes her living as a tank diver in a giant hydroponics farm/fish farm. They make her boyfriend disappear for genetic experimentation, because he’s the only human the researchers have ever seen who is completely cancer-free. She poisons the fish and leaves the farm compound forever to find him. Very few workers have ever left the compound, because it’s so dangerous outside. Some bad stuff happens.