(1) Whenever any sentence of imprisonment is passed under this Act or whenever any sentence of death is commuted to imprisonment, the presiding officer of the Coast Guard Court which passed the sentence or such other officer as may be prescribed shall direct that the sentence shall be carried out by confinement in a civil prison.
     (2) When a direction has been made under sub-section (1), the Commanding Officer of the person under sentence or such other officer as may be prescribed shall forward a warrant in the prescribed form to the officer in charge of the prison in which such person is to be confined and shall arrange for his despatch to such prison with the warrant.