Please go through above links for information.
Explosion of flammable methane gas released from rocks in the tunnel under construction is supposed to be a probable reason. If that is so, however small or big a tunnel work or its usage is, there is a need for continuous monitoring for flammable games and taking action for ventilation, flameproof fittings, tools, equipment; spark arrestors, restricted entry etc, the way it is done in mines
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