[hallihax]

Nature abhors two things that humans adore: straight lines, and walls.

All kinds of innovative solutions to contain ecological damage have come and gone, and will continue to come and go - but there's no working around nature. Everything we do will be undone by nature at some point; probably sooner rather than later. Ultimately, the only thing 'containment' does is just make it somebody else's problem in the future.

I don't think there's any realistic prospect of 'safely' containing anything in the ocean - possibly some kind of tethered buoyant container might be a useful innovation for the immediate future, but it's not going to be a permanent solution, and our best bet is to massively reduce the damage we do in the first place rather than keep kicking the can down the road.

Even the continents will be destroyed and renewed ultimately - perhaps our best long-term bet is to try to manually send the 'bad stuff' down into the outer core and just let it be obliterated and recycled.