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The famous Navy Seals unit is a special operations group trained to carry out missions on land and in the air, but Seals are best known for their underwater work. Payment explains their history, their missions--which often involve scuba diving and underwater demolitions--and what it takes to become a Seal. Readers get a sense of the intense and exhausting work involved in being a Seal, as well as the resources and methods used to successfully complete dangerous missions.