A Tunnel - but its a mile long tunnel

It's September and it's raining but we know we are going to be dry for some of our trip, as we are paddling through (and back) the Foulridge tunnel. It's a mile long with no towpath and just wide enough for a canal barge so you dont want meet something coming in the opposite direction, so there are traffic lights! You have 30 mins to get through. Once through we explore the other side, before returning back to our base through the tunnel.

If you are going to paddle this tunnel, dont forget your torches and please only enter when the lights are green.