● Mode of execution
Snorkeling and scuba diving both are a modification of swimming, but snorkeling is done on the water surface while a person faces down towards the sea. It makes a person explore the beauty of the sea while swimming above it. Snorkeling only requires good breathing control and swimming skills, and even snorkeling gears are simple.
Scuba diving is a rather rigorous activity that involved a complete immersion in water. So, it requires training, exclusive gear, and skills to execute it. “SCUBA” is literally an acronym that says “Self Contained Underwater Breathing Apparatus.”