Toxic gas slows efforts to rescue 13 workers trapped in India hydropower tunnel

Toxic gas slows efforts to rescue 13 workers trapped in India hydropower tunnel
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Toxic gas prevented rescuers from reaching 13 workers trapped in a collapsed hydropower tunnel in India on Wednesday after a gas explosion two days earlier killed 12 workers. The blast triggered by a buildup of methane gas tore through the tunnel Monday at the 500-megawatt Teesta Hydroelectric Pr...