Which of the following could be classified as a marine casualty?

The classification of a marine casualty encompasses incidents that result in significant impacts on safety, navigation, or the environment. An unintended grounding of a vessel clearly falls into this category as it represents a situation where the vessel is unable to navigate safely, potentially causing damage to the ship and the seafloor, or threatening the safety of the crew and cargo.

Marine casualties are typically characterized by events that pose a risk to life, property, or the marine environment, and grounding incidents often necessitate immediate action to mitigate further risks.

In contrast, successful docking maneuvers are routine operations conducted safely and do not imply any accident or incident. An injury requiring first aid, while serious, may not be classified as a marine casualty unless it is part of a larger incident affecting the vessel's operation. Moreover, a minor engine check is a maintenance activity and does not represent an operational failure or incident impacting maritime safety. Thus, the unintended grounding of a vessel is the situation that meets the criteria for classification as a marine casualty.