Informal Recreational diving flag

Signal flag A(lpha) - "I have a diver down - Keep clear" This article refers to underwater diving by humans. For other uses of the term diving, see dive and diving Underwater diving is the practice of going underwater with or without breathing apparatus. Recreational diving is a popular activity (also called sports diving or subaquatics). Professional diving (Commercial Diving or Diving for Financial Gain) takes a range of diving activities to the underwater work site. Levels of training and types of equipment and gases used differ between types of diving.