Snorkeling much simpler than Scuba diving is sport where a using a tube the diver floats on the water’s surface. One end fits in the diver’s mouth(Who is below the water surface) and the other end extends above the water.
Scuba which stands for self-contained underwater breathing apparatus (SCUBA) requires intense training at least for a couple days. Scuba divers carry a tank of air that allows them to breathe while deep underwater. Divers while underwater explore fish and corals. Diving is usually a ocean sport but some divers also explore lakes, rivers, and ponds.