Brine 73. A sine wave at 440 Hz, originating from Subway Tunnel. Recorded in a container environment, era: 1960s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #2151 — Brine 73
ID#2151
Rarity
LO:63%
Frequency
440 Hz
X-HI:7%
Wave Type
Sine
X-HI:13%
Resonance
Soft
X-HI:8%
Era
1960s
X-HI:6%
Origin
Subway Tunnel