Hum. A square wave at 1200 Hz, originating from Deep Ocean. Recorded in a anechoic environment, era: 1960s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #5455 — Hum
ID#5455
Rarity
LO:61%
Frequency
1200 Hz
EX:4%
Wave Type
Square
X-HI:10%
Resonance
Warm
X-HI:11%
Era
1960s
X-HI:6%
Origin
Deep Ocean