Two decades ago, in November 2002, the sinking oil tanker Prestige caused significant environmental damage to the Spanish and French shores.1 On 20 June 2022, the Court of Justice of the European Union (‘CJEU’) constituted as Grand Chamber has rendered a judgment in the proceedings between London Stream-Ship Owners’ Mutual Association Ltd (‘the London P&I Club’) and the Kingdom of Spain2, stirring up debate within the European arbitration community. Arbitration is generally excluded from the scope of many European instruments for international judicial cooperation.3 Hence an array of questions arise at the intersection of national courts and arbitration. The Prestige case can serve as a framework within which the different legal issues are developed further.