Snorkeling requires safety. It needs to be able to master the skills of breathing through the snorkel. For safety reasons, it is generally recommended that "experienced" skin diving master, freediving instructors or scuba diving instructors to provide guidance. The content of the guidance includes equipment usage, basic safety measures, precautions and biological protection guidance. Same as scuba diving, it is generally recommended not to snorkel alone, but to snorkel with as team or under the guidance of a skin diving master or diving instructor.