92. (1) The Collector of Customs shall not grant a port clearance to any ship unless a certificate issued by the Mercantile Marine Office established under this Ordinance is produced to him to the effect that the ship is duly manned in accordance with the provisions of this Chapter. (2) If any ship attempts to go to sea without a port clearance under sub-section (1), the Collector of Customs or any officer authorised by him in this behalf may detain the ship until a Certificate mentioned in sub-section (1) is produced.