THE ADVENTURE BEGINS

Harry and his uncle Professor Von Hardwigg have decoded a message left by icelandic scientist Arne Saknussemm describing how to enter the Center of the Earth. The message says something like "Descend into the crater of Sneffels to go to the Center of the Earth, I did it" They go to Iceland where the Volcano Sneffels lies and meet Hans a native who wishes to join the adventure. 

When the group reaches the top of the mountain they see a message from Arne Saknussemm, and head into the crater.