This is the only photo I have of the position of PB 106. It was taken from the top of Razor Hill in 1995 so the distance can be distorting. The PB is not the white object in the centre of the picture (which I think was an electricity or Telecom sub-station), but on the next hill immediately behind. The apparent power line is on the first hill. The village on the right is Pik Shui Sun Tsuen.
On the far side of the first hill, facing towards the PB, were at least three entrances to tunnels, with some trenches nearby.
