Merchant Shipping Act (Cap. 234), article 139

139. (1) A seaman shall not by any agreement forfeit his rights on the ship, or be deprived of any remedy for the recovery of his wages, to which in the absence of the agreement he would be entitled, and shall not by any agreement abandon his right to wages in case of the loss of the ship, or abandon any right that he may have or obtain in the nature of salvage; and every stipulation in any agreement inconsistent with any provision of this Act shall be void. (2) Nothing in this article shall apply to a stipulation made by the seamen belonging to any ship, which according to the terms of the agreement is to be employed on salvage service, with respect to the remuneration to be paid to them for salvage services to be rendered by that ship to any other ship. Wages not to depend on freight.