Firstly if you intend to visit this site double check the tide tables before setting off, to give yourself enough time to get there are back and avoid an air-sea rescue. The cliffs are also very unstable we heard numerous small rock falls and you don’t want to be underneath one.
There are numerous caves and what looks like the remains of a ships boiler on the the way around from Cowbar.
The remains of the 17th Century Alum Tunnel were revealed by coastal erosion in the 1990s. Subsequent landslips and erosion are rapidly removing the tunnel at a rate of several feet per year, and its only a matter of time before a further landslips buries it, or its completely lost to the sea.
The left-hand tunnel is now eroded nearly all the way back to what looks like a wall, it appear to be built against this wall, rather than actually being a blocked entrance although I cannot be certain if there is another tunnel behind or not. The outside edge of the inner course of bricks has been recently exposed to reveal symbols (perhaps masons marks, or maybe even something to indicate the order of construction ?) A row of bricks is also visible under the tunnel base.
The right-hand tunnel is open and contains the remains of sleepers and rails as well as a large pile of washed in stones and debris.
At this point there is a very large roof collapse with a chasm open in the cliff above, knowing the instability of the cliffs I though it wise not to progress any further, despite the tunnel looking in good condition further on.
Tracks can be seen leading off into the distance after the collapse, they would presumably at some point connect with a shaft from the Alum Works at the cliff top.
For anyone intending visiting I cannot say enough times, always remember this site is extremely dangerous.