DIVER SAFETY AND REGULATIONS
Allowable Area Of Operation Of Diver In Underwater Activity
Any diver using a self-contained underwater breathing apparatus, a forced air breathing line system, a snorkel, or any other means of underwater air supply for the purpose of underwater activity, operating in the waters of South Dakota, except in an area from which all motorboats or sailboats are prohibited from operating, shall perform the activity within an imaginary cylinder extending downward from an imaginary circle formed on the surface of the body of water by revolving a seventy-five (75) foot radius three hundred sixty degrees about a point marked by the display of a flag. The flag is referred to as the diver-down flag. The diver-down flag shall be a rectangle with a bright red field crossed by a diagonal white strip running from the upper-left corner to the bottom-right corner of the rectangle and shall be clearly visible and securely attached or anchored to a float, a rubber tube, a diver, or a boat.
Operation Of Boat Or Other Surface Activity In Diver's Allowable Area Prohibited
No watercraft under power with an internal combustion engine may be operated within the surface area described above, nor may any waterskiing or surfboarding or other surface activity potentially dangerous to the diver be performed in the area described by the circle, except when the craft or activity are a part of or related to the diving activity. 
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