It’s a risky game, but the payoff is pretty huge.

It’s not the Mines of Moria though. This Lord of the Rings-esque pic from Urban Exploration Resource was taken below east Sydney, in the Woolloomoolloo Reservoir.

Built in 1930s, to store oil for the nearby Garden Island Naval Base. Used till 1960s. Now disused.

Massive twin reservoirs, oil slicked walls and pillars, 8m high, each half the size of a football field (which code, i dunno). Inset centres with steps, a bit of water mixed with oil, big ladders, killer resonance, stinks of oil.

uer.ca says the manhole is on Lincoln Avenue.