The next day, the two men prepare for their dive. The diving instructor tells them that they will need to fill their mouths with air in order to go deeper than their current limit, which is only 30 to 40m. He explains that mouthfill is a technique that divers need to use if they want to go even deeper than this limit. He says that the weather is nice and the air feels fresh. The two men discuss the new student, who can't really lie. He's both strong and fatalistic. They discuss the sport of diving, which they call "stupid" because it's so deep. They talk about how deep they can go, and the only thing they can do is to go as deep as they can think of as their limit.