Star Trek: That Which Divides

Located in an area of non-aligned space near Federation and Romulan territory, the Kondaii system is home to a unique stellar phenomenon: a spatial rift that opens every three years in proximity to the system’s sole inhabited planet. Only during this brief period is communication possible with the small, mineral-rich planetoid inside the rift. The local population has established a mining colony on this planetoid, and for the limited du ration that the rift is open, a massive interplanetary operation is set into motion: ferrying mineral ore to the home planet while simultaneously transferring personnel and replenishing essential supplies and equipment—everything necessary to sustain the colony before it once again enters forced isolation.