Trill. A noise wave at 4096 Hz, originating from Subway Tunnel. Recorded in a anechoic environment, era: 1990s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #1203 — Trill
ID#1203
Rarity
HI:20%
Frequency
4096 Hz
EX:3%
Wave Type
Noise
X-HI:6%
Resonance
Absolute
EX:2%
Era
1990s
X-HI:9%
Origin
Subway Tunnel