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It was CS gas, which is a type of tear gas, that was used against those in tunnels in the Viet Nam conflict. It did not "suck oxygen" out of the tunnels, because there was nothing that would do that. Instead, the CS directly affected the occupants. Use the link below to learn more.

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Q: What weapon was used to suck the oxygen out of the Viet Cong tunnels in the Vietnam War?
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Rolling thunder was an air campaign over North Vietnam; most Viet Cong lived in South Vietnam. The few in NV, however, made tunnels.


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