How water came out from the rocky wall?

Chapter please?

behind the granite wall right?.

Well, it is a science fiction book.so anything related to science can happen.

Hans picks up his axe and starts to make a hole in the granite wall or rock. When the axe goes 2 feet down,professer lidenbrock comes to help but before he could help,the water came out bursting from the hole and it was boiling hot!. So they started screaming.