Japanese Tunnel and Trenches SE of Mansfield Road [????- ]
A major position with long trenches and a at least 2 Tunnel entrances. One big entrance collapsed in the hillside and one smaller vertical entrance on the level of the trenches.
Tunnel rats are welcome to explore.
There's also a long waterpipe skirting around the slope from West to East. Don't go further downhill as the tunnels and trenches are just 10 to 15m above it.