Section 148(3) in The Coal Mines Regulations, 2017
(3)Where it is intended to carry out any exploratory work in a mine or part belowground likely to contain irrespirable atmosphere,-(a)all work shall be done under rescue cover only;(b)no party of less than three persons shall be allowed to proceed to carry out such work; and(c)every such party shall carry a suitable apparatus approved by the Chief Inspector for detecting carbon monoxide gas and also an approved flame safety lamp.
