Visited this place 3 times now and it just keeps giving n giving . found 3 little tunnels so far , all of which i've explored .. there is allegedly 3 or possibly 4 more tunnels of much greater length to be explored IF they are still accessible . Project was abandoned in about 1920 and the site was briefly used as a training ground for the army during WW2 . the condition of the tunnels is SUPERB, cant believe they are 100 or so years old. no bats live in these but there are a few butterflies hibernating in them and HUGE squadrons of mozzies :/ ive made a few videos on the place if anyone's interested. i'm no filmmaker but did my best with an iphone 7 and a gimbal