Soldier and fiancé of Glauben. He joins the underground expedition and is tasked with keeping a diary of their journey. He survives the perilous adventure and marries Glauben years later.
They cooperate as members of the expedition team.
Axel and Hans travel together with the Professor during the underground expedition, including the crossing of the subterranean ocean.
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.
Olsen expands Axel's understanding of the underground world and guides the expedition toward its revelations.
Olsen assists the expedition, reveals the hidden city to Axel and the group, and explains that time is relative rather than absolute.
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