Peal. A sawtooth wave at 528 Hz, originating from Subway Tunnel. Recorded in a underwater environment, era: 1940s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #0702 — Peal
ID#702
Rarity
MID:45%
Frequency
528 Hz
X-HI:6%
Wave Type
Sawtooth
X-HI:9%
Resonance
Crystalline
X-HI:5%
Era
1940s
EX:4%
Origin
Subway Tunnel