Hum 28. A noise wave at 440 Hz, originating from Subway Tunnel. Recorded in a anechoic environment, era: 1960s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #3591 — Hum 28
ID#3591
Rarity
HI:23%
Frequency
440 Hz
X-HI:7%
Wave Type
Noise
X-HI:6%
Resonance
Dense
X-HI:6%
Era
1960s
X-HI:6%
Origin
Subway Tunnel