Underwater habitats are structures designed for humans to live and work beneath the ocean's surface. These habitats provide a controlled environment where researchers can study marine life, conduct experiments, and explore underwater ecosystems. They are often equipped with life support systems to supply air, water, and food. These habitats can vary in design, from small research stations to larger complexes. Some well-known examples include the Aquarius Reef Base in Florida and the Neptune Memorial Reef in the Caribbean. Underwater habitats help scientists gain insights into oceanography and the effects of climate change on marine environments.