From the future optimism of the past to today's utopias, artificial islands, chemical disasters, intensive efforts to improve the marine environment, projects to raise awareness of the seas in anticipation of upcoming climate changes, rising sea levels, and warmer oceans. And what does the future scenario look like for the Öresund, as well as the Baltic Sea, in relation to the gigantic artificial peninsula Lynetteholm, which Denmark is in the process of building as protection against future storm surges?