Relocation

When the depths of the oceans began to be mapped, it was noticed that the depth was not static, but the ocean floor seemed to breathe in rhythm with the day. The distance of the bottom from the surface fluctuated by hundreds of meters.

This is when the world's largest recurring migration was discovered, where at night the vast biomass of the deep sea moves to feed in richer hunting grounds closer to the surface. This migration mixes nutrients in different layers, and it is vital for the maintenance of ocean ecosystems.