What is the problem with pollution that enters the oceans locally?

It dissipates.
The location is limited to the area of the pollution.
All species in the deep ocean die because the pollution sinks.
Pollution circulates to all parts of the ocean.
All species in that locality die automatically

or suffer from health problems, and the pollution can also harm human health if seafood from the area is consumed. The pollution can also disrupt the ecosystem and food chain, leading to further impacts on marine life.