1-27. After the infiltrating detachment enters the water at the launch point, its first action is to link up on a swim line and then swim along the predesignated azimuth toward the primary BLS. The equipment, enemy situation, and level of unit training determine whether they swim on the surface or subsurface. In some cases, a combination of surface and subsurface swimming techniques, commonly called turtle backing, can greatly extend the swimmers’ range. However, it requires a closed-circuit underwater breathing apparatus (UBA), aspecial compass, and increased unit training.
1-27. After the infiltrating detachment enters the water at the launch point, its first action is to link up on a swim line and then swim along the predesignated azimuth toward the primary BLS. The equipment, enemy situation, and level of unit training determine whether they swim on the surface or subsurface. In some cases, a combination of surface and subsurface swimming techniques, commonly called turtle backing, can greatly extend the swimmers’ range. However, it requires a closed-circuit underwater breathing apparatus (UBA), aspecial compass, and increased unit training.<br>
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