Trill. A noise wave at 1200 Hz, originating from Subway Tunnel. Recorded in a anechoic environment, era: 2020s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #2204 — Trill
ID#2204
Rarity
X-HI:13%
Frequency
1200 Hz
EX:4%
Wave Type
Noise
X-HI:6%
Resonance
Dense
X-HI:6%
Era
2020s
X-HI:6%
Origin
Subway Tunnel