(1)A person sentenced under Part II of this Act to imprisonment or detention shall be subject to this Act until the expiration of the term of his sentence, whether or not he would have ceased to be subject to this Act apart from the provisions of this subsection; and in relation to any such person this Act shall apply as it applies in relation to an able seaman.
(2)If any person not otherwise subject to this Act, being in custody by virtue of section fifty-one or section ninety-five of this Act, commits or is reasonably suspected of having committed an offence which, if he were subject to this Act, would be an offence against any provision of Part I of this Act, he shall be treated for the purposes of that provision and of Part II of this Act as having been subject to this Act at the time of the offence or suspected offence, and as continuing to be so subject thereafter.
(3)Where by virtue of subsection (2) of this section a person who does not hold any naval rank or rate is treated for the purpose of any provisions of this Act as a person subject to this Act, this Act shall apply to him for that purpose—
(a)if he holds any military or air force rank, as it applies to a person holding the corresponding naval rank or rate;
(b)if he held any naval rank or rate or any military or air-force rank when last subject to this Act apart from this section, as it applies to a person holding that or the corresponding naval rank or rate;
(c)in any other case, as it applies to an able seaman.