Pulse 45. A sawtooth wave at 528 Hz, originating from Subway Tunnel. Recorded in a underwater environment, era: 1960s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #0242 — Pulse 45
ID#242
Rarity
MID:41%
Frequency
528 Hz
X-HI:6%
Wave Type
Sawtooth
X-HI:9%
Resonance
Dense
X-HI:6%
Era
1960s
X-HI:6%
Origin
Subway Tunnel