Which of the following is NOT a sign of distress for divers on the surface?

Floating calmly is a behavior that typically suggests a diver is not in distress. When a diver is floating peacefully on the surface, it implies they have control over their buoyancy and are likely in a stable state, whether resting or enjoying the aquatic environment. This contrasts sharply with other behaviors indicative of distress, such as thrashing wildly or waving arms, which signal a struggle to maintain buoyancy or a need for assistance. Shouting for help is also a clear indication that a diver is experiencing difficulty and is in need of immediate support. Therefore, floating calmly stands out as a sign of safety and stability, validating that it is not a distress signal.