Music: user-supplied Trace (promo version), recorded at the earlier tunnel rave.
Binaural processing uses HRTF measurements by Bill Gardner and Keith Martin, MIT Media Laboratory, 1994.
https://sound.media.mit.edu/resources/KEMAR.html
KEMAR data: Copyright 1994 MIT Media Laboratory; free use with attribution to the authors.
Interpolation: libmysofa, Christian Hoene / Symonics GmbH, https://github.com/hoene/libmysofa
Tunnel acoustics and trajectory are an artistic model, not measured location acoustics.
Footsteps: Fantozzi, Grass/Sand & Stone (soft-surface Sand L/R takes), submitted by qubodup.
https://opengameart.org/content/fantozzis-footsteps-grasssand-stone
Wind in Tall Grass: Joseph SARDIN / BigSoundBank, sound 0908; outdoor stereo recording.
https://bigsoundbank.com/wind-in-tall-grass-s0908.html
Both recordings: CC0 1.0 https://creativecommons.org/publicdomain/zero/1.0/
Edits: trimming, EQ, gain, footstep arrangement/binaural positioning; wind crossfaded for continuous ambience.