This chapter discusses the breath-holding practices of human divers. Human breath-hold diving is widely practiced today as a popular recreational activity. It also persists as a regular occupation in Japan, Korea, Indonesia, and Polynesia, but it has declined generally as a profession in most regions of the world, where it has been practiced for centuries. Skin divers, professional as well as recreational, usually limit the duration of their underwater excursions to not much longer than a minute, and likewise usually limit their descents to less than twenty meters depth. The professional breath-hold divers show only modest similarity to the seal's diving adaptations. This is not to suggest that their diving skills are trivial; they are, however, the product of a highly disciplined training regime that results in efficient use of underwater effort for maximum productivity.
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