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Yes. Can burn. Need an approved controlled hazardous waste incinerator. Need a temperature of at least 1850°C ! There are facilities, search on EPA. But that's a huge amount of barrels down there. And still counting. And it is extremely deep. Best to leave it there, don't disturb, until a complete plan in place. Even then , complete burial is likely a valid solution . Unfortunately.

I think it's DDT waste, not DDT itself. I think at this stage they are trying to figure out what exactly is there and how many barrels, once they do - they will decide what to do with them.

My guess is they won't do anything with them, and just throw their hands up because it's too expensive.

Probably depends on how many of the barrels are intact enough to move. If they have all rusted open, there may not be anything to clean up, as the waste will have diffused into the water. Steel barrels, even if painted, will rust quickly in salt water. At that depth though, I don't know.