We're talking about the baltic sea here. Its average depth is 55m. Besides, it's already quite contaminated so there is a lot of environmental protection going

We're talking about the baltic sea here. Its average depth is 55m. Besides, it's already quite contaminated so there is a lot of environmental protection going around it. http://upload.wikimedia.org/wikipedia/commons/e/eb/BalticSea_March2000_NASA-S2000084115409_md.jpg http://upload.wikimedia.org/wikipedia/commons/e/eb/BalticSea... As you can see, there really isn't places for the water to flow back and forth, so it's not a case of "the ocean is going to handle it" Always consider the context.