Thrum 44. A pulse wave at 40 Hz, originating from Subway Tunnel. Recorded in a vacuum environment, era: 1990s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #4399 — Thrum 44
ID#4399
Rarity
MID:41%
Frequency
40 Hz
X-HI:5%
Wave Type
Pulse
X-HI:7%
Resonance
Metallic
EX:5%
Era
1990s
X-HI:9%
Origin
Subway Tunnel