http://www.naui.org/ - National Association of Underwater Instructors
http://www.ida-worldwide.com/ - International Diving Association
http://www.cmas2000.org/- Confederation Mondiale des Activites Subaquatiques
Other interesting sites
http://www.albena.bg - Albena is one of the most beautiful sea resorts on the Bulgarian seaside
http://www.bgmaps.com/ - The bulgarian maps
http://www.pbase.com/ngruev/albena - pictures from Albena
http://weather.bg/ - bulgarian weather
http://get.info.bg/visit/ - tons of information about Bulgaria and Albena
http://www.mybulgaria.info/information-about-bulgaria-19.html - tons of information about Bulgaria
http://perso.wanadoo.fr/jacfer/Multimedia - Jacky Fer & Mischel