During which operation is permission from the Captain required to flood the magazine?

The correct answer, indicating that permission from the Captain is required to flood the magazine during both inport and underway operations, reflects the seriousness of the actions involved with flooding a magazine, which is where munitions and explosives are stored.

When a vessel is inport, safety protocols are strictly adhered to prevent any accidents that could endanger the crew or the vessel itself. Flooding the magazine can significantly alter the vessel's stability and safety, making it necessary to seek the Captain's authorization.

While underway, the same level of caution is maintained. Flooding a magazine could affect the ship's center of gravity and stability at sea, potentially leading to dangerous situations. The Captain, as the ultimate authority responsible for the safety of the ship and crew, must grant permission before such actions are taken regardless of the operational context.

Thus, the requirement for the Captain's permission for this operation emphasizes the importance of maintaining safety and operational integrity during either situation.