Marine snow falls after surface plankton blooms in spring, giving the deep ocean a seasonal rhythm of its own.

But my eyes were drawn beyond that, to the deep ocean, that untamable wildness stretching north.

Adding sensors to new and refurbished telecommunications cables would establish 'a remarkable network of deep ocean mini-observatories'.

The perpetual gloom, ferocious heat and toxicity of deep ocean volcanic vents make them an unlikely home for any creature.

This indicates that changes in the glacial deep ocean already occur before the last deglaciation.