Creak. A pulse wave at 440 Hz, originating from Subway Tunnel. Recorded in a vacuum environment, era: 1970s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #3439 — Creak
ID#3439
Rarity
MID:47%
Frequency
440 Hz
X-HI:7%
Wave Type
Pulse
X-HI:7%
Resonance
Crystalline
X-HI:5%
Era
1970s
X-HI:6%
Origin
Subway Tunnel