The hatch of the International Space Station opened from the inside for the first time on November 2, 2000. American astronaut Bill Shepherd and Russian cosmonauts Yuri Gidzenko and Sergei Krikalev floated aboard the Zvezda service module. They had launched from Baikonur Cosmodrome two days prior aboard Soyuz TM-31. The station, then a collection of just three modules, was dark, cold, and smelled of sealant and metal. Their first tasks were mundane: activating the toilet, turning on the lights, and heating water for a meal. The era of permanent human habitation in space had begun with the flick of a switch.
This arrival marked the end of the station’s construction phase and the start of its operational life. The crew, Expedition 1, spent 136 days aboard, establishing routines for science and maintenance that every subsequent crew has followed. Their presence transformed the ISS from a $150 billion engineering project into a working laboratory. Continuous occupation became the station’s defining characteristic, a logistical chain of rotating crews that has never been broken.
The moment is often framed as a triumph of post-Cold War cooperation, which it was. The deeper truth is one of sheer operational necessity. The station cannot maintain its orbit or systems without human tenders. The crew’s arrival was not a ceremonial visit; it was a shift from building a house to living in it. Every experiment conducted since, every image of Earth transmitted, stems from that initial, practical act of occupation.
The impact is measured in cumulative time. The ISS has now been inhabited for over two decades, a sustained experiment in microgravity living and international logistics. It operates on Moscow time, uses English as its working language, and has hosted over 260 individuals from 20 countries. The station is a fact of the 21st century, a silent outpost whose lights have never gone out since Shepherd’s crew turned them on.