Sounds:
walking: https://pixabay.com/sound-effects/film-special-effects-walking-on-concrete-ver-2-268513/
running: https://pixabay.com/sound-effects/film-special-effects-running-on-concrete-268478/
heavy footsteps: https://pixabay.com/sound-effects/film-special-effects-heavy-walking-footsteps-352771/

Music:
Cockpit:
Singularity - The Grey Room _ Density & Time
Red Shift - The Grey Room _ Density & Time
Drifting Memories - The Mini Vandals
Outside:
https://pixabay.com/music/ambient-psychological-horror-520373/
leberch-horror-ambient-background-375933
https://pixabay.com/music/orchestral-horror-580083/
https://pixabay.com/music/mystery-horror-ambient-375934/

alarm: https://pixabay.com/sound-effects/film-special-effects-warning-alert-this-is-not-a-test-141753/


explosion: https://pixabay.com/sound-effects/film-special-effects-nuclear-explosion-386181/