A container is found leaking an unidentified substance during a port call, marked as containing Class 3 (flammable liquid) dangerous goods. What is your immediate response as OOW?

A. Open the container to identify the source of the leak before doing anything else

B. Raise the alarm, evacuate/restrict access to the immediate area, avoid all potential ignition sources nearby, consult the dangerous goods declaration/MSDS for the specific substance and its emergency response guidance, and inform the Master so the appropriate emergency response (which may include shore emergency services) can be activated — do not attempt to handle or open a leaking dangerous goods container without following the substance-specific guidance

C. Continue normal cargo operations nearby, since a single container leak rarely poses a real risk

D. Hose the area down with seawater immediately as the universal first response to any leak

A. Only the Chief Engineer needs to consider this, never the deck watchkeeper

B. None — stability is fixed regardless of loading

C. Increased displacement generally raises the centre of gravity if weight is added high up, and free surface effects in partially-filled tanks can reduce the effective metacentric height (GM)

D. Additional weight always improves stability regardless of where it is placed

A. This only matters when the vessel is at anchor

B. Negligible — watertight doors below the waterline are rarely closed anyway

C. Only relevant if the vessel carries passengers

D. Significant — a failed watertight closure compromises the subdivision the vessel's damage stability calculations rely on, potentially allowing progressive flooding between compartments in the event of damage