Big fridge compressor - freezer from the inside.
Ilha Grande, Brazil, ferry journey with interior hum of boat, light background talking
Brazil, boat journey in Ilha Grande - boat hum & talking.
Garage room tone - no activity, low hum.
Interior atmosphere of garage - electrical hum from lights.
Greyhound bus ride - interior passenger perspective, steady highway travel, smooth, calm fan, ...
Greyhound bus ride - interior passenger POV, steady highway travel, smooth fan running.
Greyhound bus - riding passenger POV, interior, steady highway stream, faint background traffic.
Double-ended diesel ferry, riding, bow POV. Steady, calm
Double-ended diesel ferry, riding, bow POV. Steady, shudder to calm.