What looks like the work of extraterrestrials, is actually a man-made, sprawling concrete circle that encases tonnes of nuclear waste, including about 400 lumps of plutonium, one of the deadliest substances known to science. Now the Dome is cracking and leaking. Storm tides flood over it, seawater is inside it. The fear is that a typhoon will break the whole thing apart and spew it’s radioactive contents into the ocean. Reporter Mark Willacy discovers that the Dome is a literal concrete example of America’s cavalier treatment of the Marshall Islanders.