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. The author explains their history and their missions, which often involve scuba diving and underwater demolitions. Readers will learn what it takes to become a SEAL. They'll get a sense of the intense and exhausting work involved in being a SEAL, as well as the resources and methods used...