Why is 'Mary Celeste' still unsolved?

A lack of physical evidence and of relevant documentation is the reason why the mystery of the ghost ship Mary Celeste still is unsolved. Nobody knows the motivations or whereabouts of the half brig in question's captain, two passengers, three officers and four seamen. The hermaphrodite brig lies in pieces under an artificial island off Haiti while the combination of court documents and of ship records does not explain the part barkentine part schooner's abandonment between the Azores and Portugal or the Mary Celeste 10's disappearance.