Shriek. A sine wave at 528 Hz, originating from Subway Tunnel. Recorded in a cathedral environment, era: 1990s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #4925 — Shriek
ID#4925
Rarity
LO:56%
Frequency
528 Hz
X-HI:6%
Wave Type
Sine
X-HI:13%
Resonance
Brittle
X-HI:6%
Era
1990s
X-HI:9%
Origin
Subway Tunnel