Located at a depth of 14 metres, the entrance to the tunnel can be found at the end of the track that leads down from the quayside slipway. Once you reach it, you'll discover a thick white cable tied off at the entrance. Running along the roof for the entire length of the tunnel, this high-visibility cable provides a useful guideline for even the most experienced overhead environment diver.

As you progress through the tunnel, be aware that the depth will steadily increase - and the water temperature drop - until you reach the exit at 22 metres. Visibility, water temperature and ambient light levels can varying massively between the entrance and exit to the tunnel so make sure you that you keep your torch switched on even once you've exited the tunnel. We recommend that any diver entering the tunnel carries at least *two* torches.

At the tunnel exit, you'll find yourself very close to the base of the Crushing Works. To locate the Crushing Works from the tunnel exit, fin forward with the wall on your right hand shoulder for approximately 5 metres.