In this chapter, we learn that the water in the Gleipnir cave is so strong that it's able to break through the skin of anyone who tries to touch it. In other words, if you slap the wall, you're going to get stuck in the water for a long, long time. The only way out of the water is to use a bottle of sambuca, which is a kind of alcohol that's supposed to help you stay cool in the middle of the storm. We're not sure if this is a good idea or not, but we're guessing it'll work.