(1)  Where the proper officer has reason to believe that any aircraft, vehicle or animal in India or any vessel in India or within the Indian customs waters has been, is being, or is about to be, used in the smuggling of any goods or in the carriage of any goods which have been smuggled, he may at any time stop any such vehicle, animal or vessel or, in the case of an aircraft, compel it to land, and--

   (a)  rummage and search any part of the aircraft, vehicle or vessel;

   (b)  examine and search any goods in the aircraft, vehicle or vessel or on the animal;

   (c)  break open the lock of any door or package for exercising the powers conferred by clauses (a) and (b), if the keys are withheld.

   (2)  Where for the purposes of sub-section (1)--

   (a)  it becomes necessary to stop any vessel or compel any aircraft to land, it shall be lawful for any vessel or aircraft in the service of the Government while flying her proper flag and any authority authorised in this behalf by the Central Government to summon such vessel to stop or the aircraft to land, by means of an international signal, code or other recognized means, and thereupon, such vessel shall forthwith stop or such aircraft shall forthwith land; and if it fails to do so, chase may be given thereto by any vessel or aircraft as aforesaid and if after a gun is fired as a signal the vessel fails to stop or the aircraft fails to land, it may be fired upon;

   (b)  it becomes necessary to stop any vehicle or animal, the proper officer may use all lawful means for stopping it, and where such means fail, the vehicle or animal may be fired upon.