The Professor, Axel and Hans climb down into the crater of the volcano. We've been climbing down for hours. We're never going to reach the bottom! Stay calm, Axel. I can't hold on any longer! Yes you can. Just a bit more! We're almost there, Axel. The climb down is long and difficult. Stop! We are at the bottom. Finally! At the bottom of the crater, the men find three large shafts. Which one did Saknussemm use? We don't even know if we're in the right place. Yes, we do! Look! Here are Saknussemm's initials on this rock. He said to use the one the sun shines on at the end of June. Today's the 25th! We're running out of time! And today is cloudy. Let's hope it's sunny tomorrow! Luckily, the next day the sun comes out and shines down on one of the shafts. Wonderful! Now we know which one to use.