the dive footage was from my friend. i just snorkeled. i don't know any local dive shops but my friend lives there and we stayed at a bed and breakfast on aka island and they have equipment you can use for diving. you take a ferry to the island from naha, about an hour boat ride. i can try to get the information on the place from my friend if you are interested in setting up something. it is about 5000 yen to get there and 10000 yen a night to stay there, they provide 2 meals and it cost about 6-7000 yen for each dive.
i used a gopro hero 3 black edition