The NIGHTMARES of Tunnel Rats In Vietnam

There was no military occupational specialty for it, no training school, no doctrine, no manual.

In 1966, the United States Army began sending men alone, one at a time, into Vietkong tunnel networks that stretched 250 kilometers beneath the Iron Triangle and Coochie District.

The passages were 28 in high and 16 in wide.

The air was over 100° and thick with decomposition.

The enemy had spent 20 years building the space, rigging it with fragmentation grenades on trip wires, sharpened bamboo stakes coated in human waste, and pit vipers tethered in the dark where a man’s groping hand would land.

The tunnel rat carried a flashlight, a pistol, and a knife.

Nothing else.

The Australian sappers, who performed the same mission, suffered a 33% casualty rate.

The Americans never kept an official count.

The tunnels were built in laterite clay, a soil so dense with iron oxide that it absorbed artillery strikes and held the weight of tanks overhead.

The Vietkong had spent nearly two decades carving the Coochie network by hand with hoes and woven baskets, and conventional tactics could not touch it.

CS tear gas pumped into the entrances, hit the first S-bend, and stopped dead.

Water flooded in and drained out the bottom of galleries.

10 meters below.

Grenades and demolition charges sealed the openings and intombed the printing presses, surgical theaters, and command documents the army desperately needed intact.

Every tunnel crimped shut was a cache of enemy intelligence buried forever.

On 11 January 1966, during Operation Crimp in the Hobo Woods, 20 kilometers north of Coochie, Sergeant Stuart Green of the First Battalion, 28th Infantry Regiment, the Black Lions, First Infantry Division, sat down during a sweep near a rubber plantation and felt a sharp sting in the back of his thigh.

He thought it was a scorpion.

It was a nail head protruding from a wooden trap door perforated with air holes.

Green volunteered to climb down.

He dropped into an underground dispensary and found more than 30 Vietkong who vanished deeper into the network before anyone could stop them.

In a single operation, patrols partially mapped at least 200 km of interconnected tunnels.

The scale was no longer theoretical.

Someone had to go down there.

But no one had trained for this.

There was no military occupational specialty, no doctrine, no school.

The men who descended into the dark invented the job under fire.

Captain Herbert Thornton, a chemical core officer with the first infantry division, built the first dedicated American tunnel rat teams in 1966 after realizing his own gas attacks were destroying more intelligence than they produced.

His selection criteria were blunt.

Volunteers only, roughly 5’6 or under, slim enough to fit passages 28 in high and 16 in wide.

What Thornton wanted beyond the physical was harder to measure, an inquisitive mind, a lot of guts, and a lot of real moxy in knowing what to touch and what not to touch to stay alive.

A striking number of the best were CubanAmerican or Mexican-American.

Their unofficial motto known gratum anos rodentum dog Latin for not worth a rat’s ass captured the gallows humor of men who understood the arithmetic of their assignment.

The standard issue M191145 was deafening and blinding in a passage 2 feet wide.

Most rats bought personal 38 Smith and Wesson revolvers on the black market.

PFC Harold Roer paid a helicopter pilot $25 for his.

The rest of the kit was a flashlight that died from humidity within minutes, a KBAR knife, and a wire spool with a field phone earpiece for one-way communication back to the surface.

Many rats ripped out the earpiece immediately.

It killed their most important sense, hearing.

Down there, in air thick with bat guano, decomposing bodies and human waste.

At temperatures exceeding 100°, sound was the only thing keeping them alive.

They called it the black echo.

Many gave up cigarettes, gum, and aftershave.

The Vietkong could smell them coming.

The enemy had built the space, lived in it, fought from it.

The tunnel rat was the intruder in someone else’s home.

On that same day, 11th January 1966, several kilometers from where Green found his trap door, Corporal Robert Bob Bautell of three field troop Royal Australian engineers, aged 33, became wedged in a concrete trap door between two tunnel galleries.

Smoke and CS gas thrown down adjacent entrances consumed the oxygen around him.

Struggling to free himself, he dislodged his respirator.

He esphixxiated in the dark.

Sapper Allen Sparrow Christy tried twice to reach him.

Twice Christy passed out and had to be dragged back to the surface.

Bautell was the first Allied tunnel rat to die underground.

Christy carried that day for the rest of his life.

The death of Bob Boutell was the most traumatic event that I ever experienced in my entire lifetime.

One man went back into those tunnels, not once, not twice, but across three full tours in Vietnam.

The only sergeant the Vietkong placed on their top 10 most wanted list alongside generals.

His name was Robert Batton.

And what happened to him on his last clearance is the story the surviving tunnel rats still tell.

Sergeant Robert Batman, First Engineer Battalion, First Infantry Division.

Three tours, four Purple Hearts.

A hard charging New Jersey NCO who had volunteered for tunnel duty so many times that the Vietkong knew him by reputation.

On a multi-day clearance operation in the Iron Triangle, Batten’s eight-man team worked through a sprawling complex over three consecutive days, flushing roughly 150 Vietkong from chamber after chamber.

The rhythm was mechanical and merciless.

Batton would drop into a chamber, identify the trap doors leading deeper, and clear them in pairs with his lieutenant.

Three shots through the door, swap revolvers with the lieutenant for a reloaded weapon.

Move to the next.

Three shots.

Swap.

Move.

The muzzle flash in a space too small to stand lit the walls in orange snapshots.

The sweat on his forearms, the dirt ceiling two feet above his head, brass casings rolling in the mud, the smell of cordite layered over something older and worse.

Door after door, each one could be the last.

Staff Sergeant Pedro Pete Rejo Ruiz, also of the first engineer battalion, carried a different kind of reputation.

A Cuban refugee who had fired on Castro’s troops as a teenager, Rejo Ruiz volunteered to enter tunnels known to contain Vietkong after other rats had already been wounded trying.

He stepped on three pressure mines on three separate occasions, none detonated.

He was naturalized as a United States citizen while recovering from combat wounds and went back to the tunnels.

When asked about the work, Rejo Ruiz said only, “I loved it.”

A line he never finished in print.

On the final day of Baton’s iron triangle clearance, the rhythm broke.

Batton and his lieutenant were working the same system.

Three shots, swap, move.

Third trap door.

A Vietkong fighter below slammed it shut.

Half a second of silence.

Then the door swung open again and a fragmentation grenade dropped into the lieutenant’s lap.

The detonation in a passage 28 in high had nowhere to go.

Concussion, shrapnel, and a wall of dust hit both men simultaneously.

Batton and his lieutenant shredded in the legs, crawled back through their own blood to the entrance.

Both were medevaced.

Batton received a bronze star and his fourth purple heart and was sent stateside.

The tactical logic was simple and unbeatable.

The Vietkong defender had built the space.

He knew where every trapdo sat.

He could wait in a recessed al cove, let the rat pass, and strike from behind or below.

The tunnel rat’s only counter was speed and nerve.

Clear each door before the defender reacted.

Batton’s system was improvised doctrine born from survival, not training.

It worked until it didn’t, and there was no procedure on Earth that could make a single man alone in the dark safe against a defender fighting from inside his own fortress.

In March 1966, Lieutenant Colonel George Easter Jr.

Of the Second Battalion, 28th Infantry, First Infantry Division, was shot by a sniper while his men fought through a tunnel complex nearby.

Mortally wounded, Easter’s last words were a tribute to the men crawling beneath his feet.

Before I go, I’d like to talk to the guy who controls those incredible men in the tunnels.

Captain Wyn Tan Lynn commanded the Vietkong guerillas who defended Coochi.

After the war, he told journalists that of the 300 fighters under his command in January 1966, only four survived.

Coochie District lost approximately 12,000 fighters and civilians.

The tunnels were a death trap for both sides, and the Vietkong knew it.

They adapted continuously.

When gas attacks worked, they cut additional escape levels and watertapped the junctions.

When tunnel rats began finding them, they built spear hole ales, recessed positions from which a sharpened bamboo stake could be driven into a crawling man’s ribs.

Lynn confirmed they sometimes preferred bayonets to firearms underground, so as not to give our positions away.

Captured reports stated that half of any Vietkong unit had malaria at any given moment and 100% carried intestinal parasites of significance.

The army tried to solve the sound problem.

The quiet specialurpose revolver built by AI Corporation on a Smith and Wesson model 29 frame firing 15 pellet piston cartridges arrived in Vietnam in July 1969.

Only 10 were ever fielded.

Army evaluators reported that on several occasions, the weapon failed to incapacitate an enemy soldier hit from 10 ft away.

The program died.

Sound suppression in the tunnels remained a problem the United States never solved.

The psychological attrition was worse.

When Tom Mangold and John Pennate tracked down surviving tunnel rats for their 1985 history, some were still too traumatized to speak.

Many had washed out within weeks.

The few who lasted had what one veteran described as a killer instinct.

And even they came home changed.

Decades later, tunnel rat veterans still speak of nightmares triggered by tight spaces, the inability to sleep with a closed bedroom door, breakdowns during MRI scans, the tube, the darkness, the confinement pulling them back underground.

PFC Harold Roer, who had paid $25 for a revolver and crawled into the Black Echo more times than he could count, put it plainly.

I felt more fear than I’ve ever come close to feeling before or since.

The passage was 28 in high and 16 in wide.

The flashlight was dead.

The air tasted like rot.

And somewhere ahead, in the dark, someone was waiting.

The tunnels are a museum now.