The first DHARMA station discovered by the survivors in Lost was the Swan.
The Swan is found beneath the island after Locke and Boone locate a concealed entrance. Inside, the survivors discover living quarters, supplies, a computer, and a countdown timer. The station becomes the main setting for the survivors’ attempt to understand the island’s hidden systems.
The station’s computer introduces the requirement to enter the number sequence every 108 minutes. This routine creates a major division among the characters: some believe the button prevents a catastrophe, while others suspect the process is an elaborate psychological experiment.
Lost later reveals several additional DHARMA stations, including the Arrow, the Staff, the Pearl, the Flame, and the Orchid. Because the Pearl is also underground and connected to the Swan, viewers sometimes name it as the first station discovered. The survivors’ initial major station, however, is the Swan.