Silt 93. A triangle wave at 142 Hz, originating from Subway Tunnel. Recorded in a open air environment, era: 1940s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #1181 — Silt 93
ID#1181
Rarity
MID:45%
Frequency
142 Hz
X-HI:9%
Wave Type
Triangle
X-HI:8%
Resonance
Dense
X-HI:6%
Era
1940s
EX:4%
Origin
Subway Tunnel