Nachrichten 27.04.2017. SUB ECO BOL 2017. Thursday, April 27, 2017. 15 diving teams with over 100 divers from Slovenia, Croatia, Serbia and Slovakia were cleaning the seabed around Bol today. This is the 19th annual SUB ECO BOL, organized by Big Blue Diving - Bol, Croatia, TZO Bol, Bluesun Hotels & Resorts - Croatia and Municipality of Bol.