They are independent scientists pursuing related subterranean research.
Olsen reveals that he is a fellow scientist on a mission to explore the underground world, while the Professor is conducting the same kind of investig...
The Professor directs Axel's participation and documentation of the expedition.
The Professor recruits Axel for the expedition and assigns him the responsibility of keeping a diary of the journey.
The Professor's expedition employs Hans as its local mountaineer.
After arriving in Iceland, the group hires Hans, a shepherd and mountaineer, to accompany them underground.
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