Hiss. A pulse wave at 741 Hz, originating from Subway Tunnel. Recorded in a container environment, era: 2020s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #2574 — Hiss
ID#2574
Rarity
X-HI:14%
Frequency
741 Hz
X-HI:5%
Wave Type
Pulse
X-HI:7%
Resonance
Hollow
X-HI:5%
Era
2020s
X-HI:6%
Origin
Subway Tunnel