Section 23(3) in The Merchant Shipping (Crew Accommodation) Rules, 1960
(3)Access to washing accommodations shall not be directly obtained from a mess room or a sleeping room and shall wherever reasonable and profitable in the circumstances be obtained from a passageway. Provided that access to washing accommodation may be obtained directly from not more than 2 sleeping rooms accommodating not more than 4 persons in all, if the washing accommodation is appropriated for use solely by the person of persons incommoded in those sleeping rooms.
