Signal. A sawtooth wave at 528 Hz, originating from Nuclear Plant. Recorded in a underwater environment, era: 1990s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #2000 — Signal
ID#2000
Rarity
MID:35%
Frequency
528 Hz
X-HI:6%
Wave Type
Sawtooth
X-HI:9%
Resonance
Cold
X-HI:10%
Era
1990s
X-HI:9%
Origin
Nuclear Plant