cold-stunning cold-stunning cold-stunning, also known as hypothermic stunning, is a hypothermic reaction experienced by marine reptiles, notably sea turtles, when exposed to cold water for prolonged periods, which causes them to become weak and inactive. cold-stunned sea turtles may float to the surface and be further exposed to cold temperatures, which can cause them to drown. a water temperature threshold of 8–10 °c has been associated with mass turtle stunning events. after cold-stunning has taken place, there is only a very short period of time when sea turtles can be safely rescued. two rescued cold-stunned turtles one study indicates that ocean warming has led to an increase in cold-stunning events in the northwest atlantic. notable instances in 2016, 1,700 turtles were cold-stunned in north carolina, following "an unusually temperate fall and early winter". in 2021, nearly 5,000 cold-stunned turtles were rescued in texas during a winter storm; it has been called the largest cold-stunning event to be documented in the state.