Six northern Europe countries bordering the North Sea said Tuesday that they have signed an agreement to work together to protect underwater infrastructure in the northern part of the Atlantic Ocean from an increased risk of sabotage. The Danish Ministry for Climate, Energy and Utilities called the North Sea a hub for critical infrastructure that connects Europe through electricity cables, gas pipes and telecommunications connections and is an important source of renewable energy. “An increasing mutual dependence across borders has arisen — and with it an increased risk of sabotage and unwanted attention from hostile actors," the Danish ministry said.