Bark 31. A square wave at 2400 Hz, originating from Subway Tunnel. Recorded in a vacuum environment, era: 1960s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #1515 — Bark 31
ID#1515
Rarity
MID:27%
Frequency
2400 Hz
EX:4%
Wave Type
Square
X-HI:10%
Resonance
Absolute
EX:2%
Era
1960s
X-HI:6%
Origin
Subway Tunnel