Underwater breathing / Respirator

Nowadays , snorkel diving became more and more popular. But why ? First, I think it can fulfill people’s desire that could see beautiful underwater scenery.Second. snorkel is a sport everyone can do even you can’t swim.Third. It is a sport, it can make our body more and more stronger! People usually do snorkel diving using schnorkel, so you can only scan the beautiful scenery by floating on the sea surface or diving short time! So,we need a product which is more convenient than schnorkel.