Poso Wreck is a reef-to-wreck scuba site in the Thousand Islands with a lighthouse entry, a sandy lead-in, and a deeper wreck beyond the shallow reef. The site rewards careful buoyancy, steady navigation, and a conservative plan when current or visibility are less forgiving. Plan it as a guided route dive rather than a relaxed shallow sightseeing stop, because the approach, depth, and water movement can all change how the dive feels.