Hum 90. A triangle wave at 741 Hz, originating from Deep Ocean. Recorded in a cave environment, era: 1990s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #4247 — Hum 90
ID#4247
Rarity
MID:35%
Frequency
741 Hz
X-HI:5%
Wave Type
Triangle
X-HI:8%
Resonance
Hollow
X-HI:5%
Era
1990s
X-HI:9%
Origin
Deep Ocean