law: 148. Interim custody until execution of sentences of death.
  A person sentenced to death may be detained in naval custody or may be removed to a civil prison to be kept in custody until further orders be received from the Central Government, the Chief of the Naval Staff or the officer ordering the court- martial by which he was sentenced to death or other prescribed officer and the order in the prescribed form of the Central Government, the Chief of the Naval Staff or the convening authority or such officer shall be sufficient warrant for detaining the person in custody.