Signal 74. A sine wave at 888 Hz, originating from Subway Tunnel. Recorded in a cave environment, era: 1980s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #2449 — Signal 74
ID#2449
Rarity
MID:31%
Frequency
888 Hz
EX:3%
Wave Type
Sine
X-HI:13%
Resonance
Metallic
EX:5%
Era
1980s
X-HI:8%
Origin
Subway Tunnel