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"deep sea" is correct and usable in written English.
You can use it when talking about the ocean depths and the organisms that inhabit them. For example, "Mysterious creatures inhabit the deep sea, and scientists are still discovering new species."
Dictionary
deep sea
noun
The deeper part of the sea or ocean in which no light penetrates
Exact(17)
Deep Sea Res.
Taste the "deep sea wind" foam!
Deep sea fishing is not sustainable.
Deep Sea (4:42) – Slow tempo cut.
I am using deep sea core data.
Waite likened release to deep sea diving.
Similar(32)
What about deep-sea pathogens?
"It's like going deep-sea diving.
Deep-sea fishing is also important.
Deep-sea fishing is also economically important.
He went deep-sea fishing.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com