Section 2(zu) in The Orissa Building and Others Construction Workers (Regulation of Employment and Conditions of Service) Rules, 2002
(zu)"Safety screens" means an air and water tight diaphram placed across the upper part of a compressed air tunnel between the face and bulk head, in order to prevent flooding the crown of the tunnel between the safety screen and the bulkhead to provide a safe means of refuge and exit from a flooding or flood tunnel;
