Deep underwater
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0Deep underwater
"Deep Underwater" is an ambient field recording from several dozen meters down: a muffled low-frequency hum, distant clicking sounds and slow tonal shifts characteristic of the layered structure of the sea. Underwater acoustics differs from air fundamentally: sound travels through seawater roughly 4.4 times faster than through air (Urick, Principles of Underwater Sound, 1983), and low frequencies attenuate much more slowly — so an underwater soundscape is essentially a slow background in the 50–800 Hz band with very rare high-frequency events.
Psychoacoustically, this narrowband low noise is almost a perfect analogue of "pink noise," which by Zhou et al.'s meta-review (Frontiers in Human Neuroscience, 2012) correlates with increased delta-wave density in deep sleep. The underwater scene also gives the brain a powerful "isolated from the world" signal: humans are not evolutionarily adapted to a water environment, and the subconscious treats "submersion" as a complete break from social noise. This produces the distinctive "acoustic cocoon" feeling on which many flotation-tank sensory-deprivation techniques rely (Kjellgren et al., BMC Complementary Medicine, 2008).
This recording works well for meditative falling asleep, for yoga nidra, for people suffering from noisy neighbours (low-frequency masking works more gently than white noise), and for writing work on science-fiction, mystical and underwater themes. Pairs with Whale Song, Ocean, 432 Hz Harmonic. Not recommended as background for meetings and calls — the muffled feel of one's own voice in a room with this underlay can cause mild discomfort.
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ReduxSound v1.0.0
Ambient sound mixer for relaxation and focus