Section 176.3 - Unacceptable hazardous materials shipments(a) A carrier may not transport by vessel any shipment of a hazardous material that is not prepared for transportation in accordance with parts 172 and 173 of this subchapter, or as authorized by subpart C of part 171 of this subchapter.(b) A carrier may not transport by vessel any explosive or explosive composition described in § 173.54 of this subchapter.Amdt. 176-1, 41 FR 16110, Apr. 15, 1976, as amended by Amdt. 176-30, 55 FR 52688, Dec. 21, 1990; 74 FR 2268 , Jan. 14, 2009