Whir. A sine wave at 888 Hz, originating from Subway Tunnel. Recorded in a vacuum environment, era: Pre-War. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #1645 — Whir
ID#1645
Rarity
MID:35%
Frequency
888 Hz
EX:3%
Wave Type
Sine
X-HI:13%
Resonance
Cold
X-HI:10%
Era
Pre-War
EX:3%
Origin
Subway Tunnel