Static. A square wave at 440 Hz, originating from Subway Tunnel. Recorded in a cave environment, era: 2020s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #0136 — Static
ID#136
Rarity
LO:51%
Frequency
440 Hz
X-HI:7%
Wave Type
Square
X-HI:10%
Resonance
Harsh
X-HI:8%
Era
2020s
X-HI:6%
Origin
Subway Tunnel