Toll 05. A square wave at 440 Hz, originating from Subway Tunnel. Recorded in a cave environment, era: 2010s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #1291 — Toll 05
ID#1291
Rarity
LO:66%
Frequency
440 Hz
X-HI:7%
Wave Type
Square
X-HI:10%
Resonance
Warm
X-HI:11%
Era
2010s
X-HI:7%
Origin
Subway Tunnel