1 Hour UNDERWATER SOUNDS Black Screen Audio Only HD

1 Hour underwater sounds sound effect on loop — 1 hour black screen — hydrophone deep.

THIS VIDEO IS A STILL IMAGE — black screen with a small line-art icon in the middle. There is NO ANIMATED VIDEO. Pure audio for hearing-test checks, alarm-replacement loops, study background, sleep timers, or just letting the sound run while you do something else.

#blackscreen #audioonly #1hour

Audio: "lake Asalnai, Lithuania, underwater listening" (radio aporee / Internet Archive item aporee_69015_80083, public domain).