Needlefish have gained a dangerous reputation due to several impaling incidents involving fishermen and snorkelers in the shallow reefs of Sulawesi, Indonesia. Jeremy Wade investigates these occurrences, eliminating various marine species before identifying needlefish as the killers. Their long, sharp bodies can pose a serious threat to divers. This highlights the importance of being cautious and aware of your surroundings when diving, especially regarding the marine life you may encounter.