The longest rail tunnel in the world, the Gotthard, is set to open in Switzerland on June 1. An immersive video tour gives a behind-the-scenes look at one of the biggest engineering feats in Swiss history.
For ten years, hundreds of workers braved tropical temperatures underground to get the tunnel finished. It has a system of two one-way tubes, linked by emergency escape routes every 325 metres.
For the full 360 degree experience, first download the YouTube app to your mobile device. Then click here to watch on mobile through the app, where it's possible to swipe the screen and have a look around while the video plays.