The Air Line hookah diving systems have a compressor at the surface that delivers air to divers below through long hoses and a demand regulator similar to the kind used in scuba. The divers are freed from wearing heavy, bulky tanks. It’s an easy, hassle-free way to dive that's always available whenever you want to dive. When you use an Air Line Direct Drive System, there is no need to get tanks filled, and no running out of filled tanks when you still want to do more diving. Occupies much less space/weight on the boat compared to similar scuba gear.