Tunnels under Cittadella, Victoria via Near the lower battery

In an area that is being revamped but the barrier being open. There's an entrance right in the corner, which I tried to climb up to as I noticed it first, but failed and injured my leg a bit (a few shallow gashes).

However on retreat, I noticed another entrance, which looked easier to get to. A scramble up a slope leads into a tunnel just about standing height if my height, this is not part of the tourist stuff, but it's not closed off or sign posted no-entry, anywhere.

This tunnel led into a small maze of chambers and corridors and a couple of collapses. Most of these chambers were completely empty except for one which contained an old bed-frame. There was several bats maybe about 6 or 7, they looked like lesser horseshoe, we were quite and avoided shining light at them to not disturb them. Eventually the corridor ends at the other entrance. Not wanting to try and tackle the climb again (about 8m broken) we went back the way we came.