Bioshock 2, underwater city, Rapture, Big Daddy, drill arm, Little Sister, ADAM syringe, Art Deco architecture, dystopian environment, splicers, genetic modifications, plasmids, 1960s era, detailed textures, rust and corrosion, neon signs, flooded sections, eerie atmosphere, dim lighting, narrative-driven, first-person perspective, complex story, moral choices, immersive gameplay, atmospheric sound design, advanced AI, high-quality graphics, sequel, canon to series, expanded lore.