The only way in and out of the Inchindown Oil Tanks in Scotland. Workers had to push themselves on a wheeled board down a track and through a pipe.

These are screenshots from a Youtube video because I couldn’t find any actual pictures that show the entrance system up close. Those are tiny wheels underneath the board. [Here](https://www.youtube.com/watch?v=lLUcOFwZvyY) is the Youtube video on the whole facility, which contains footage of the system in action.