Melancholy, despair and sadness.
These are the emotions one tend to associate with a tunnel full of skeletal remains, especially in a tunnel made from a giant monster spider's remains.
That being said, while this particular mood influenced Zhen Liu, Nausicaa and the kaijin to some degree as they continued to walk down this horrible tunnel, the latter were feeling something in addition to those three aforementioned feelings.
Dread.
For reasons beyond them, they were feeling a looking sense of dread developing in their stomachs and they couldn't figure out why.
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[Hey guys...you, uh...you guys getting a fuzzy feeling where our stomaches should be? Like something bad is about to happen?,] Hurricroak asked her compatriots.
[Indeed.]
[Yup...]
[Cool, cool...none of y'all can contact Logos or Pathos right now, right?]
[Correct.]
[Yes...]