Minecraft wiki entry for Achievement_guide, associated text: This achievement is a bit harder than finding ruins as shipwrecks are rarer than ocean ruins. On rare occasions, you may find shipwrecks on land. Shipwrecks will be easily visible as they are made out of planks, which easy to spot. Also, undamaged shipwrecks are more noticeable, especially in warm oceans, due to coral reefs making them easy to distinguish.