Unless one is a professional diver or a marine biologist conducting research, the chances each tourist is allowed to enjoy diving beneath the waves are limited. This means most tourists who pick up the sport during a holiday in an exotic beach paradise will soon forget these newly acquired skills if practice and constant engagement are not part of their lives in a day to day context. PADI certification courses, in contrast, offer divers a comprehensive training on diving out in open water, combining both practical lessons as well as theoretical knowledge. Most divers will forgo securing a certification due to financial reasons or because they may not see the use of a PADI certificate but in reality, the course work, as well as the recognition, is globally recognized.