Poison Reef is a shallow patch reef in Balaclava Marine Park with coral spurs, sandy gullies, and a compact layout that suits relaxed beginner scuba. It is known for venomous reef fish and steady fish life, so slow buoyancy and hands-off control matter more than speed. Expect a protected-water reef dive with easy photo opportunities and enough terrain variation to keep the route interesting. It is a better fit for patient reef exploration and macro work than for divers looking for a deep or high-current challenge.