Which activity is not permitted when swimming in turbid water?

When swimming in turbid water, diving and underwater swimming are activities that pose significant safety risks. Turbid water, characterized by its cloudiness or murkiness due to suspended particles, impairs visibility. This can lead to various hazards, such as difficulty in determining the depth of the water, identifying submerged objects, or assessing the overall safety of the environment. When diving or swimming underwater in such conditions, swimmers increase their chances of injury due to striking unseen obstacles or misjudging the water depth.

In contrast, floating on the surface, engaging in water aerobics, and swimming with a buddy can all be safe practices in turbid water. Floating and water aerobics keep individuals primarily on the surface, where they can easily maintain visibility of their surroundings, while swimming with a buddy promotes safety through the buddy system, ensuring that swimmers can assist each other if needed.