A scuba tank is a high-pressure cylinder used to store compressed air or gas mixture for underwater breathing in scuba diving. Typically made from aluminum or steel, scuba tanks are robust and designed to withstand the pressures encountered at various depths underwater. They come in different sizes and capacities, commonly ranging from 80 cubic feet to 120 cubic feet, depending on the diver's air consumption needs and dive duration. Scuba tanks are equipped with valves for filling and regulating airflow to the diver's regulator, allowing them to breathe while exploring underwater environments. These tanks are essential equipment for recreational divers, professional divers, and underwater rescue teams, providing the necessary air supply for safe and extended dives beneath the surface.