Each night, an unseen exodus unfolds in the ocean's twilight zones. Millions of creatures, from the smallest zooplankton to larger predators, embark on a colossal vertical migration, ascending from the crushing pressures of the abyss towards the surface. This extraordinary daily pilgrimage, driven by the need for food and avoidance of predators, shapes marine ecosystems and influences global carbon cycles. The phenomenon remains one of the largest movements of biomass on Earth, yet it occurs largely beyond human sight.
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