Since this is just salted, fermented fish, which the scientist in the article claims he would like to taste, why does it need to be buried in plastic? Why not slowly pour it into a sewer, over the course of several months?
Sewers go places, and it is nearly a million liters of extremely concentrated stinky. If you do this, you take a single location source of stinky and smear it over a much larger set of locations that will then ALL be extremely stinky, in a way that isn’t easily cleaned with water as the fats and oils (also extremely stinky!) are of course not soluble.
From the linked Eater article:
>Perhaps the most promising and most discouraging event for the factory happened in 2016. That year, the provincial government approved a cleanup plan, and a private company began the process. But the cleanup was halted soon after it started when it became clear that the contractors were dumping several dozen vats of rotten fish sauce directly into the ocean. According to Ryan, the provincial government ordered the factory’s drains to be blocked to prevent any more sauce from seeping into the ocean.
https://www.eater.com/2019/5/23/18634704/st-marys-irish-loop...
I think dumping it slowly would be better than a hazardous waste landfill, but government bureaucracy is not capable of handling this situation.