Off Kume Island Blackwater Dive Schedule (May–August 2026) Set Arrival Day Dive Schedule Days / Dives Departure Notes 5A 01 May (Fri) 01–05 May 5 days / 10 dives 06 May (Wed) Early May – beginning of the blackwater season in Japan 5B 06 May (Wed) 06–09 May 4 days / 8 dives 10 May (Sun) Ideal short option for early summer diving 7A 17 July (Fri) 17–21 July 5 days / 10 dives 22 July (Tue) Great option before Japan’s national holidays begin 7B 22 July (Tue) 22–25 July 4 days / 8 dives 26 July (Sat) Ends on Saturday – ideal for working professionals 7C 26 July (Sat) 26–30 July 5 days / 10 dives 31 July (Thu) Peak summer season – warm waters and marine life abound 7D 31 July (Thu) 31 July – 03 Aug 4 days / 8 dives 04 Aug (Mon) Includes a weekend – flexible for many schedules 8A 04 Aug (Mon) 04–07 Aug 4 days / 8 dives 08 Aug (Fri) Weekday slot – quieter and ideal for return guests 8B 08...