Section 401.57 - Disembarking or Boarding(a) Except as authorized by an officer, no person, other than a member of the crew of a vessel passing through, shall disembark or board any vessel while the vessel is passing through.(b) No member of the crew of a vessel passing through shall disembark or board except for the purpose of carrying out essential duties as directed by the Master.(c) Persons disembarking or boarding shall be assisted by a member of the vessel's crew under safe conditions.(d) Persons intending on disembarking or boarding a vessel shall only do so after they have confirmed with the Captain that the vessel is fully secured in the lock with Hands-Free Mooring or with mooring lines.39 FR 10900, Mar. 22, 1974, as amended at 70 FR 12972 , Mar. 17, 2005; 76 FR 13089 , Mar. 10, 2011