Distributia
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Kavan SmithNarrator (voice)
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Thom KikotNarrator
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Guido GiordanoHimself - Geologist
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Helen CheyneHerself - Speleologist
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Silvia La PergolaHerself - Architectural Engineer
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Valerio FotiHimself - Site Engineer, METRO C
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Inge WeustinkHerself - Speleologist
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Roberto RefrigeriHimself - Electrical Engineer