Ama or uminchu, are female Japanese pearl divers that start diving at the age of 12-13 and are sometimes active into their 70s. They free dive with only a wetsuit and a traditional headscarf. They have a unique and defining technique in which they release air in a long whistle as they resurface. – WTF Fun Facts
Source: https://en.wikipedia.org/wiki/Ama_(diving)
