If ACAVs or tanks were handy they were used to crush the tunnels by gaving them in (driving back and forth, in circles, etc. over the bunkers). Otherwise engineers were called in to blow them with C4, bangalore torpedoes or TNT. If no one else was around (just grunts) the tunnels were fragged and bypassed.
Vietnam War: Find'em & Kill'em (Search & Destroy).
Napalm .
The defoliant Agent Orange .
The need to move under ground commenced when the need to move safely and with stealth was needed. US forces used air power extensively. Underground systems provide physical safety and unseen movements from aircraft.
The Cu Chi tunnels are a large network of underground tunnels in Ho Chi Minh City (formerly Saigon). The tunnels were originally constructed from 1946-1954 as a hiding place for the Viet Minh, nationalist guerillas who fought the Japanese during World War 2 and then France. More tunnels were constructed during the Vietnam War to serve as hiding spots, communication, and supply routes for soldiers. The Cu Chi Minh tunnels are part of the overall network of tunnels that underlie much of Vietnam.
This question cannot accurately be answered; because not all of the tunnels were ever discovered. Probably not even today, 40 to 50 years after the war's been over. Tunnels were dug in North Vietnam to protect personnel from aerial bombing (air strikes); tunnels were dug in South Vietnam for the same reason, with the added reason of moving men & supplies AND storing supplies. Tunnels were dug in Laos and Cambodia for the same reasons explained for digging them in South Vietnam. MANY of those tunnels were destroyed by GIs by driving over them (crushing them/collapsing them) with their 13 ton M113 ACAVs (Armored Cavalry Assault Vehicles) or their M551 Sheridan Tanks (17 tons), or their M48 Patton tanks (52 tanks). Or an air strike was called in on them, to destroy them; or Engineers were called in the demo them.
The defoliant Agent Orange .
A war of attrition; search and destroy to obtain body counts.
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.
they are vertical tunnels, angle tunnels, and horizontal tunnels. THE END
A tunnel rat in Vietnam refers to a soldier, typically from the U.S. or South Vietnamese forces, tasked with exploring and neutralizing the extensive network of tunnels used by the Viet Cong. These tunnels served as hiding places, storage for supplies, and bases for launching attacks. Tunnel rats faced significant dangers, including booby traps, enemy combatants, and the claustrophobic conditions within the tunnels. Their missions were critical in disrupting enemy operations and gaining intelligence during the Vietnam War.
Strategy-Attrition Tactic-Search & Destroy