sticky-yellowDescription based on PAVN articles published in 2017:
The tunnel was dug inside a hill roughly 50m high in Ban Nari, Northwest of Tchepone
The main entrance was on higher ground while the exits were built at the bottom of the hill.
The tunnel was big, about 200m long, 2m high and 1.5m wide.
There were 5 command rooms inside the tunnel: Command staff room, Logistics department room, Engineer department room, Political department room, Technical department room. There was a briefing room located in the center with a table of 20 seats, a map, and multiple field telephones. The room of 559th commander Dong Sy Nguyen was also mentioned, but with no description.
Likely there was also a generator room, a medical bay similar to other NVA tunnels of the time.
image559th commander and commissar inside the tunnel complex
imageRecreational model of Engineer command room in HCM trails museum, Hanoi
imageRecreational model of the briefing room in HCM trails museum, Hanoi
imageOther side of the room
imageRecreational model off Logistics command room in HCM trails museum, Hanoi
imageRecreational model of the tunnel complex in HCM trails museum, Hanoi