Water is a fantastic way of insulating radiation. Nuclear plants store used fuel rods in a pool that's only 20-30 feet deep, and you could theoretically swim to within a few feet of the highly radioactive rods without issue.
A melted down nuclear reactor at the bottom of the ocean has zero ecological impact. It's bizarre to consider, but it's been backed up by extensive research.
How long do you think it'll take liberals to figure out that derivatives and oil futures don't translate into ammunition and rations if you outsourced all your factories?