Fade 50. A square wave at 142 Hz, originating from Subway Tunnel. Recorded in a cave environment, era: 2020s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #3316 — Fade 50
ID#3316
Rarity
X-LO:78%
Frequency
142 Hz
X-HI:9%
Wave Type
Square
X-HI:10%
Resonance
Warm
X-HI:11%
Era
2020s
X-HI:6%
Origin
Subway Tunnel