Section 18(3) in The Merchant Shipping (Crew Accommodation) Rules, 1960
(3)In every sleeping room in which more than one petty officer or other rating is accommodated, every drawer, locker and wardrobe shall be fitted with a secure lock or hasp for a padlock. In every sleeping room in which only one petty officer or other rating is accommodated the locker or wardrobe shall be fitted with such a lock or hasp.
