"The depth of the sea is far more unknown than its vastness. Hardly have the first soundings, few and uncertain as they are, yet been made. The bold liberties we take upon the surface of that untamable element, our audacity in venturing across that profound unknown, are of little consequence and cannot diminish the sea's rightful pride. In truth, it remains closed, impenetrable."
Jules Michelet, The Sea, 1861

Where, in the relative and probably illusory calm of the depths, the whale has long since departed. Tossed by the currents and carried along invisible, endless pathways, the Moon Child, himself traversed by those currents, seems to be waiting. Perhaps he is waiting for the turbulence to subside, just as mist slowly dissolves, allowing the dark depths to become visible once more, where what he believes to be a monstrous fish appears and disappears within a time that dilates to the slow rhythm of its breathing.
There is an almost inevitable mistake we make whenever we think of the ocean: we imagine it to be still as soon as its surface disappears from view. Yet the deeper one descends, the more difficult movement becomes to perceive—and the more completely it governs everything.
In the depths, the water never ceases to travel. It neither falls nor rises. It glides. It exchanges its place with another body of water which, for centuries perhaps, has followed the same course without ever knowing either its origin or its destination. The currents move with such slowness that they seem to have renounced all haste. Yet this slowness deceives. On the scale of a human life, it is capable of displacing entire seas.
Cold water possesses a peculiar gravity. It is denser. Soundlessly, it seeks the depths as a thought naturally seeks what it does not yet know about itself. Lighter water, warmed elsewhere by a sun that never reaches these abysses, undertakes in return another journey. Thus are born immense circulations that obey no will, only an almost imperceptible difference in temperature or salinity. A few tenths of a degree are sometimes enough to set in motion masses of water whose weight exceeds all imagination. These movements have nothing of the tumult of waves. They resemble instead the slow drift of continents. They are liquid geologies.
It sometimes happens that two bodies of water meet without truly mingling. They brush alongside one another for hundreds of kilometers. Between them remains an almost invisible frontier, where density changes more rapidly than colors could ever reveal. Whoever could remain there might experience the strange sensation of passing through several seasons without advancing a single step. Deeper still, cold ceases to be a circumstance; it becomes a way of being for the water itself. The temperature varies so little that a tenth of a degree possesses the importance a mountain would have upon a plain. Nothing appears to change. Yet everything reorganizes itself around that infinitesimal difference.
Currents do not always follow a straight course. They bend and divide. They coil back upon themselves like the immense swirls of a smoke no one could ever see. Some bodies of water trace spirals stretching for dozens of kilometers before resuming their journey. Others rotate so slowly that their turning seems to belong more to time than to space. We believe them silent because the ear cannot hear them. Yet they possess a texture. Some waters seem thick without truly being so. Others give the impression of yielding more easily to whatever passes through them. This sensation does not arise from their substance, which remains the same, but from the minute differences in velocity that separate one neighboring layer from another. Water glides upon water like two sheets of glass separated by an invisible film.
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