Hush 16. A am wave at 220 Hz, originating from Subway Tunnel. Recorded in a open air environment, era: 1940s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #4569 — Hush 16
ID#4569
Rarity
HI:17%
Frequency
220 Hz
X-HI:8%
Wave Type
AM
EX:5%
Resonance
Crystalline
X-HI:5%
Era
1940s
EX:4%
Origin
Subway Tunnel