Which of the following is categorized as a critical operation on a tanker?

Transferring cargo on a tanker is considered a critical operation because it directly impacts the safety of the vessel, the crew, and the environment. This operation involves the careful handling of large quantities of potentially hazardous materials, which must be conducted under strict safety protocols to prevent spills, leaks, or other emergencies that could result in significant consequences.

During cargo transfer, various factors such as pressure, temperature, and the integrity of the cargo tanks must be monitored continuously to ensure safe operations. Any mistakes made during this process can lead to catastrophic events, including environmental disasters, loss of cargo, or accidents onboard.

While the other options involve important tasks that contribute to the overall maintenance and safety of the tanker, they do not carry the same level of immediate risk to life, property, and the environment as cargo transfer. For instance, cleaning the decks and routine inspections are essential for operational readiness but are not classified as critical operations in the same way that transferring cargo is. Fueling the vessel is also important but typically has strict regulations and procedures that differ from cargo operations.