What was the Deep Sea like During Prehistoric Times?

The Prehistoric oceans were bubbling with leviathans toothed predators almost the size of whales were common place up until fairly recently. The ferocious creatures that used to inhabit the oceans are well known about, however, what was the deep sea like during these times.

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Sources:
https://pubmed.ncbi.nlm.nih.gov/26581...
https://www.researchgate.net/publicat...
https://www.tandfonline.com/doi/full/...
https://royalsocietypublishing.org/do...
https://www.ncbi.nlm.nih.gov/pmc/arti...
https://www.academia.edu/44636598/%D0...
summary in english:
Further reading: https://sobekswimmingpool.wordpress.c...
https://www.researchgate.net/publicat...
https://www.ncbi.nlm.nih.gov/pmc/arti...