[woman speaking indistinctly over P.A. system]
[escalator humming]
[engines humming]
[birds chirping]
[airplane humming]
[birds chirping]
[siren wailing in distance]
[birds chirping]
[airplane humming]
[birds chirping]
[engines humming]
[people talking indistinctly in distance]
[engine humming]
[birds chirping]
[music playing in distance]
[engines humming]