What accident situation is considered a Serious Marine Incident?

Correct Answer: Option D — All of the above

46 CFR § 4.03-2 defines a Serious Marine Incident to include property damage exceeding $100,000, injuries requiring professional medical treatment beyond first aid that render a person unfit for duty, or significant pollution discharges. These criteria trigger mandatory post-casualty drug and alcohol testing requirements for involved crewmembers.