Pulau Karya is a shallow Thousand Islands training site with a soft sandy bottom and a short reef beside it. It suits beginner dives and skills practice, with easy marine-life spotting on the reef edge and enough structure for a relaxed shallow dive. Boat traffic and weekend beach use mean the best plan is to keep the dive compact, stay buoyant near the exit, and lean on nearby Pramuka support if you need more gear or logistics help.