What is used to show the presence of a partly submerged object being towed?

The correct response indicates that multiple methods can be utilized to signal the presence of a partly submerged object being towed. Partly submerged objects can pose a serious hazard to navigation, so it's essential to provide adequate warnings to other vessels in the vicinity.

Each suggested option contributes to creating visibility and awareness of the towed object. A single red buoy is a recognized navigation aid used to mark hazards, while underwater lights can enhance visibility in darker conditions, increasing the chances of other boats noticing the obstruction. Flashing warning lights on the towing vessel serve to alert approaching vessels to the potential danger posed by the towed object.

By selecting the comprehensive choice that encompasses all these options, the answer acknowledges that a combination of these methods is the most effective approach to ensure safety on the water. This multifaceted strategy helps reduce the likelihood of accidents and enhances maritime awareness.