Rift. A sawtooth wave at 888 Hz, originating from Subway Tunnel. Recorded in a cathedral environment, era: 1960s. One of 5555 echoes — sounds no one thought to save.
Name
ECHO #5420 — Rift
ID#5420
Rarity
MID:33%
Frequency
888 Hz
EX:3%
Wave Type
Sawtooth
X-HI:9%
Resonance
Dense
X-HI:6%
Era
1960s
X-HI:6%
Origin
Subway Tunnel