Bioshock 2 underwater city, Rapture, Big Daddy, Subject Delta, Little Sister, Eleanor Lamb, Sofia Lamb, dystopian, Art Deco architecture, Splicers, ADAM, plasmids, gene tonics, drill arm, rivet gun, atmospheric, decaying beauty, sea life, coral, neon signs, flooded sections, moral choices, protect, harvest, moral ambiguity, ethical dilemma, philosophical themes, advanced technology, retro-futuristic, genetic engineering, survival horror, gripping narrative, immersive environment, detailed textures, dynamic lighting, suspenseful soundtrack, first-person perspective.