what happen in chapter 22 and 24?

Chapter 22- The men reach the level of primitive rocks, which assure the Professor they're on the right path. The men's water supply is gone, Axel collapses, and Hans disappears.

Chapter 24- The men find a stream..... they will not die for lack of water. They continue on their journey, and Hans takes care that they will all stay together by roping them one to another. Along the way, Axel realizes that is his uncle's caculations were correct they'd have passed Cape Portland and were now directly under the ocean floor.