The master, owner or agent of [a special trade passenger ship] or a pilgrim ship shall not, otherwise than by reason of perils of the sea or other unavoidable accident, allow the ship to touch at any port or place in contravention of any express or implied contract or engagement with the [special trade passengers] [ Substituted by Act 69 of 1976, Section 2, for " Unberthed passengers " w.e.f. 1.12.1976).] or pilgrims with respect to the voyage which the ship was to make and the time which that voyage was to occupy, whether the contract or engagement was made by public advertisement or otherwise.