Which organization should be notified about all on-duty diving cases involving specific conditions?

The organization that should be notified about all on-duty diving cases involving specific conditions is the Navy Safety Center, also known as NAVSAFECEN. This center plays a crucial role in promoting safe operational practices and ensuring the health and safety of Navy personnel involved in diving operations.

When diving incidents occur, especially those involving particular conditions that could pose risks to the divers, it is essential to report them to the Navy Safety Center. This reporting helps in gathering data to improve safety measures, analyze trends, and develop safety training and guidelines. The center's focus on reporting diving mishaps and evaluating safety programs is vital for preventing future incidents and protecting the lives of divers.

In terms of the other options, while NAVSEA (Naval Sea Systems Command) is responsible for overseeing the acquisition and maintenance of Navy ships and submarines, its main concern isn't directly tied to safety in diving operations. OPNAVINST serves as administrative instruction from the Chief of Naval Operations, which covers a multitude of Navy-wide policies, but does not specifically handle incident reporting. The US Navy Safety Center is indeed involved in safety management but falls under the purview of NAVSAFECEN for diving-related cases, highlighting why NAVSAFECEN is the correct choice for notifying