Rusty oil tankers full of Russian oil sail through the North Sea. Their owners and insurance are unclear, even as they transport millions of tons of sanctioned merchandise. Putin's war economy depends on this export, which continues through Dutch waters despite sanctions. Zembla maps this shadow fleet and spends months investigating questionable ship movements. The maritime and ecological risks for the Netherlands and surrounding countries are discussed. Through data research and experts, Zembla follows the oil and money trail and shows how Dutch companies continue to indirectly fill Putin's war chest.