Wave. A pulse wave at 142 Hz, originating from Subway Tunnel. Recorded in a corridor environment, era: 1940s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #1138 — Wave
ID#1138
Rarity
MID:40%
Frequency
142 Hz
X-HI:9%
Wave Type
Pulse
X-HI:7%
Resonance
Brittle
X-HI:6%
Era
1940s
EX:4%
Origin
Subway Tunnel