Ping 19. A square wave at 1200 Hz, originating from Subway Tunnel. Recorded in a container environment, era: 2000s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #2097 — Ping 19
ID#2097
Rarity
MID:39%
Frequency
1200 Hz
EX:4%
Wave Type
Square
X-HI:10%
Resonance
Crystalline
X-HI:5%
Era
2000s
X-HI:8%
Origin
Subway Tunnel