Explain Section 137 concerning a deserter concealed on board a merchant vessel through the negligence of the master.
Section 137 states that the master or person in charge of a merchant vessel, on board of which any deserter from the Army, Navy, or Air Force of the Government of India is concealed, shall, though ignorant of such concealment, be liable to a penalty not exceeding five hundred rupees if he might have known of such concealment but for some neglect of his duty as such master or person in charge or but for some want of discipline on board of the vessel. [Chapter 7, Section 137]