When we talk about underwater wine, we often focus on what happens inside the bottle. But what about outside it? What kind of environment surrounds the wine as it matures beneath the sea? And how do elements such as light and sound —which behave radically differently in water than in air—affect this process?
At Crusoe Treasure we have been ageing wines at a depth of 20 metres in Plentzia Bay for more than a decade. And we have learned that the ocean acts not only as a thermal regulator or a pressurised environment: it is also a medium in which physical stimuli are transformed. This silent, dark environment—though not completely so—creates a microcosm with no equivalent on land.+
1. Sound beneath the sea: faster, denser, more vibrant
Sound travels more than four times faster in water than in air. While it travels through the atmosphere at around 343 m/s (at 20 °C), in seawater it travels at approximately 1,500 m/s. This is because water is a denser medium, in which particles are closer together and transmit vibrations more effectively.
Furthermore:
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Water dampens low frequencies less, allowing low-frequency sounds (such as those made by boats or marine life) to travel long distances.
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High frequencies are attenuated more quickly, creating a deeper, more enveloping and continuous soundscape.
What does this mean for the wine?
The underwater winery Crusoe Treasure is not in absolute silence. It is “inhabited” by a constant symphony of bubbling, currents, marine life and distant sounds. All of this creates a continuous, subtle vibration that surrounds the bottles for months.
Although the bottles are hermetically sealed, the surrounding environment is not inert: these vibrations pass through the glass and may, according to current hypotheses, influence the evolution of micro-oxygenation and the interaction between the wine’s compounds.
Studies have even explored the use of sound waves to accelerate winemaking processes, such as stabilisation or clarification. Could the underwater environment work in a similar way, but naturally and over an extended period?
2. Light beneath the sea: the realm of blues
Another fundamental element of the underwater environment is light —or rather, the lack of it.
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Sunlight fades rapidly with depth. At 20 metres, only between 10% and 20% of the light at the surface remains.
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The first colours to disappear are reds, oranges and yellows.
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Blue is the dominant colour because it penetrates deepest in salt water.
This “blue filter” is not merely an aesthetic detail: it has physical implications. The wine is protected from the most aggressive ultraviolet rays, which can affect its evolution, oxidation and even its aroma. The darkness beneath the sea acts as a natural shield, slowing and stabilising processes that may be more erratic in a conventional winery.
In addition, the absence of intense or variable light cycles provides environmental consistency that encourages more balanced and uniform maturation.
3. An environment in constant motion
Unlike a cellar on land, where bottles rest motionless, there is always slight movement at sea. Currents, pressure, the micro-vibrations of the environment... All of this creates a continuous interaction between the wine and its bottle.
This movement, although imperceptible, encourages greater integration of winemaking compounds:
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Better integration of tannins and anthocyanins (colour).
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More harmonious development of tertiary aromas.
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Greater stability of the wine on the palate.
When we add to this the fact that the sea is a pressurised environment (2–3 atmospheres at that depth) and remains at a constant temperature of between 10 and 15 °C throughout the year, we have the ideal setting for a different, innovative and natural form of ageing.
What does the wine gain from this environment?
Although no single factor can be attributed to every nuance, underwater wines tend to share certain characteristics:
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Greater roundness on the palate.
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More integrated and complex aromas.
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A slightly different evolution from its land-aged counterpart (when comparing the same vintage).
And most importantly: a personality of its own, difficult to replicate in another environment.
The sea as a winemaking ally
Wine has always been closely linked to the land, but at Crusoe Treasure we have learned to view it from another angle: from the depths of the sea.
There, the wine does more than age: it listens, breathes and allows itself to be enveloped by the blue darkness and by a different rhythm, deeper and more enveloping. Each bottle is not merely a vessel for wine, but a witness to a story told through invisible vibrations, pressures and currents.
The next time you taste one of our underwater wines, think about that. About what cannot be seen or heard. Because sometimes, the subtlest things leave the most lasting impression.
Would you like to accompany your tasting with the soundtrack of the sea?
Listen to our official playlist:
🎧 Crusoe Treasure – Underwater Wine Experience