Thrum. A sine wave at 8000 Hz, originating from Mountain Pass. Recorded in a underwater environment, era: 2010s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #1810 — Thrum
ID#1810
Rarity
MID:28%
Frequency
8000 Hz
EX:2%
Wave Type
Sine
X-HI:13%
Resonance
Metallic
EX:5%
Era
2010s
X-HI:7%
Origin
Mountain Pass