Tunnels of Cuchi. Tom Mangold & John Penycate. 1986.

One of the more remarkable but little-known campaigns of the Vietnam War was fought inside the 200 miles of secret tunnel networks around Saigon between Viet Cong guerilla and special American forces known as ‘Tunner Rats.’ This is the harrowing account of American soldiers of great courage who volunteered to enter black tunnels armed only with pistons and knives, and often fought in deadly hand-to-hand combat with the enemy.