The eco grid was the eco network which stabilized many of Haven City's functional components such as the Shield Wall and the barriers around the city. It was built by Mar, maintained by Vin and controlled at the power station. Prior to his death, Vin "dumped" his brain into the eco grid so that he could continue to maintain it and manage it (as well as other critical functions for the city) even after he died. The eco for the grid was collected at the eco mine at the time of the city's creation, however, it was abandoned after the eco disappeared. It then drilled for eco in other locations such as the strip mine and the drill platform. In Act 3 of Jak II, Kor sabotaged the grid to deactivate the shields of the city when Sig unintentionally allowed the metal heads into the city through the