They do things a little differently in Sweden - they speak Swedish, they spent a lot on social programs, and they fish with fireworks - for red gummi-flavored fish, I can only assume.

It's unclear if these teens were actually trying to fish or not - probably not. They probably just wanted to see what would happen if they shot off a rocket under the ice. And it turns out, pretty much the exact thing you would expect, which is EXACTLY what you want to happen.