After weighing time and cost, Yan Fei decided not to dig further down but to build a second oil warehouse instead. Therefore, each oil warehouse was located 300 meters below Dream Island and within the 800-meter space above, and due to the solid state of the underground steel rocks, Yan Fei wasn't worried about the cavernous warehouses collapsing.
In the following period, Yan Fei installed equipment in both warehouses to increase the internal pressure and oil extraction machinery.
To complete the installation of the oil warehouse equipment, Yan Fei invested a substantial amount of resources. These pieces of equipment were produced by the Equipment Production Factory and the mini-production workshop on Dream Island. They were very advanced, ensuring that the oil from the underground warehouse could automatically spurt out to the surface, substantially reducing the cost of oil extraction and giving Dream Island's oil a price advantage.