Exploring a vent shaft on Paris RER

This vent shaft is located on a more recently built part of the RER. There are no vent shafts in this tunnel as the tunnel, so I couldn't explore much of it. There were spaces to hide by leaning into the tunnel segments, but I was not properly hidden. I wanted to walk to the nearest station, which was a mile away, but I couldn't be sure that I wouldn't be seen, so sadly I couldn't explore this tunnel.