Technical diving
Sparefishing
Freediving
Underwater sport
 
Diving

Recreational diving can be as job or hobby and people, going underwater, will breath from cylinders with usual air. There are also possibility to use for diving enriched air but before that divers need to be certified as Enriched Air Nitrox diver. By most of recreational training organisations the maximum depth for diving with air, is 40 metres. To go deeper, it calls sometimes as technical diving and usually they use another gasmix than air (trimix or heliox).