Signal. A square wave at 220 Hz, originating from Mountain Pass. Recorded in a underwater environment, era: 1960s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #4727 — Signal
ID#4727
Rarity
LO:68%
Frequency
220 Hz
X-HI:8%
Wave Type
Square
X-HI:10%
Resonance
Warm
X-HI:11%
Era
1960s
X-HI:6%
Origin
Mountain Pass