Plunk. A square wave at 440 Hz, originating from Subway Tunnel. Recorded in a cave environment, era: 1990s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #1019 — Plunk
ID#1019
Rarity
X-LO:78%
Frequency
440 Hz
X-HI:7%
Wave Type
Square
X-HI:10%
Resonance
Warm
X-HI:11%
Era
1990s
X-HI:9%
Origin
Subway Tunnel