Which of the following is considered a secondary dive skill?

Performing a safety stop is classified as a secondary dive skill because it is an important practice that divers should implement after completing their ascent, rather than an essential skill needed during the dive itself. A safety stop, typically at about 5 meters (15 feet) for 3 minutes, allows divers to off-gas any nitrogen that may have built up in their bodies during the dive. This is not mandatory for all dives but is highly recommended for deeper and longer dives to help prevent decompression sickness.

In contrast, other mentioned skills such as managing buoyancy and returning safely are considered primary skills essential for safe diving. Managing buoyancy is crucial throughout the dive to ensure control and prevent accidental descents or ascents, while returning safely encompasses navigation and awareness of one’s surroundings to ensure a diver can make it back to the surface and the boat or shore safely. Breathing techniques are also fundamental for proper gas management and comfort underwater.