Very little organic carbon actually reaches the seafloor, though, because it is remineralised while sinking through the water column. Then, most of the organic matter that actually does reach the seafloor is similarly remineralised rather than buried.

But say we did manage to get massive amounts of organic matter into the deep ocean, we could feasibly end up creating a so-called "dead zone" that is depleted in oxygen like we see elsewhere in the ocean, which would be detrimental to deep sea life.