Grey Bound. A pulse wave born in Subway Tunnel, resonating since 1970s. Captured at 528 Hz in a chamber space. One of 350 Legendary echoes — sounds that almost escaped recording.
Name
ECHO #0035 — Grey Bound
ID#35
Rarity
X-HI:8%
Frequency
528 Hz
X-HI:6%
Wave Type
Pulse
X-HI:7%
Resonance
Absolute
EX:2%
Era
1970s
X-HI:6%
Origin
Subway Tunnel