Carrier 87. A square wave at 440 Hz, originating from Subway Tunnel. Recorded in a open air environment, era: 1980s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #4244 — Carrier 87
ID#4244
Rarity
X-LO:78%
Frequency
440 Hz
X-HI:7%
Wave Type
Square
X-HI:10%
Resonance
Brittle
X-HI:6%
Era
1980s
X-HI:8%
Origin
Subway Tunnel