If you've made it to Holographic Currency you have completed Deep Sea Exploration and have access to the Oceanic Terminal. It works the same way that the Arctic Harbor does. Start sending the submarine on missions to collect Orichalcum.I need it for Holographic currency 120 Orichalcum and also for Seasteading 140 Orichalcum
Have you completed "Deep Sea Exploration" yet? If so, use the Oceanic Terminal to generate Orichalcum. If not, you must do that first to unlock the Terminal.Ok but i can not open the holographic currency and i also need 90 for open advanced hydrophones.