(3) Without prejudice to subsection (2), where a Saint Lucian ship to which this Part applies is either an existing ship of not less than 150 gross tons or a new ship of not less than 24 metres in length, and does not normally ply on international voyages but is in exceptional circumstances, required to undertake a single international voyage, the Minister, on the application of the owner of the ship, specifying the international voyage in question, may exempt the ship while the ship is engaged on that voyage.