Ping. A granular wave at 8000 Hz, originating from Subway Tunnel. Recorded in a vacuum environment, era: 1940s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #3236 — Ping
ID#3236
Rarity
HI:22%
Frequency
8000 Hz
EX:2%
Wave Type
Granular
EX:3%
Resonance
Cold
X-HI:10%
Era
1940s
EX:4%
Origin
Subway Tunnel