I need help finding a location on Chernarus

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Okay so I have A LOT of hours on Days and especially Chernarus - but cannot seem find this one location again. There's this one tunnel (or something resembling a tunnel at least) that I (actually my friend) came a across about a year ago, which we thought would be a perfect spot for building a mini-base in. I saw it on his share screen and we both commented on that it would be ideal for a base (I think you could block the whole entrance with one gate), but we never did end up building there. ...