It shall be unlawful to operate or use, or to permit the operation or use of, a vessel for the carriage or transportation, or for any part of the carriage or transportation, either directly or indirectly, of any passengers, for hire or otherwise, between a point or place within the United States and a gambling ship which is not within the jurisdiction of any State. This section does not apply to any carriage or transportation to or from a vessel in case of emergency involving the safety or protection of life or property.