As second year master students at the EPFL we were asked to produce an ‘énoncé théorique’ : a theoretical research, exploring a subject that we deemed interesting and relevant to introduce our next semester’s project. We chose to study the Baltic Sea through a selection of various climatical, geological, social and political topics. This book is the result of this 4 months research. The 'énoncé' goes into detail — through maps, diagrams, charts, etc. — searching for clues and patterns on what an overexploited territory looks like (different layers of interaction) and what planning such a territory would imply.