# Soyuz TM-31: The Mission That Began Continuous Human Life Aboard the ISS Canonical URL: https://www.teknalyze.com/on-this-day/soyuz-tm-31-launch-2000/ Published: 2026-10-31 Updated: 2026-10-31 Author: Teknalyze Desk Section: On This Day Categories: On This Day, Technology Primary topic: Soyuz TM-31 launch, ISS, William Shepherd, Yuri Gidzenko, Sergei Krikalev Historical event date: 2000-10-31 ## Event summary On October 31, 2000, a Russian Soyuz-U rocket lifted off from Baikonur Cosmodrome in Kazakhstan, carrying three space travelers toward the International Space Station (ISS). Aboard the Soyuz TM-31 spacecraft were American astronaut William Shepherd and Russian cosmonauts Yuri Gidzenko and Sergei Krikalev, the members of Expedition 1. ## Fact box Event: Soyuz TM-31: The Mission That Began Continuous Human Life Aboard the ISS Date: October 31, 2000 People or organization: Not stated in the article Why it matters: Every successful task helped demonstrate that the ISS could function as a sustained human outpost rather than a collection of interconnected spacecraft. ## Key points - Researchers could design experiments requiring extended observation, repeated measurements, and direct intervention by trained crew members. - The mission’s legacy remains closely connected to the International Space Station’s extraordinary operational history. - A continuously staffed station offered opportunities for scientific research that short-duration missions could not easily provide. ## Historical context Two days later, on November 2, the spacecraft docked with the station, and the crew entered what would become their home for the next several months. Their arrival began an uninterrupted period of human presence aboard the ISS that has continued for more than a quarter-century. ## Article On October 31, 2000, a Russian Soyuz-U rocket lifted off from Baikonur Cosmodrome in Kazakhstan, carrying three space travelers toward the International Space Station (ISS). Aboard the Soyuz TM-31 spacecraft were American astronaut William Shepherd and Russian cosmonauts Yuri Gidzenko and Sergei Krikalev, the members of Expedition 1. Their mission marked a turning point in space exploration, establishing the foundation for continuous human habitation aboard the ISS and transforming the orbiting complex from an assembly project into a permanently crewed research outpost. Two days later, on November 2, the spacecraft docked with the station, and the crew entered what would become their home for the next several months. Their arrival began an uninterrupted period of human presence aboard the ISS that has continued for more than a quarter-century. Although the station had received visiting astronauts and cosmonauts before Expedition 1, Soyuz TM-31 delivered its first long-duration resident crew, initiating an entirely new phase of international spaceflight. The mission represented more than a successful journey into orbit. It was the beginning of an ambitious experiment in sustained human operations beyond Earth, combining engineering, scientific research, and international cooperation on a scale never previously achieved. ### From an Orbiting Construction Site to a Permanent Home When Soyuz TM-31 launched, the International Space Station was still in the early stages of construction. Its first module, the Russian-built Zarya Functional Cargo Block, had entered orbit in November 1998, followed by the American Unity connecting module later that year. The Russian Zvezda Service Module arrived in July 2000, providing essential systems needed to support a resident crew, including living quarters, life-support equipment, and facilities for controlling the station’s orientation. Before Expedition 1, visiting Space Shuttle crews had assembled and serviced the growing complex, but the station remained unoccupied between missions. The arrival of a permanent crew would fundamentally change how the ISS operated. Instead of relying exclusively on short visits from Earth, the station could be maintained continuously, with astronauts and cosmonauts monitoring its systems, conducting experiments, and preparing for future construction missions. This transition required far more than simply delivering people into orbit. The crew needed to activate and maintain essential systems, establish daily operating procedures, organize supplies, and verify that the station could support extended habitation. Every successful task helped demonstrate that the ISS could function as a sustained human outpost rather than a collection of interconnected spacecraft. ### The Soyuz Spacecraft and Its Critical Role The Soyuz TM-31 mission relied on one of the most established spacecraft families in human spaceflight. Developed during the Soviet space program, Soyuz had evolved through decades of operational experience, supporting missions to earlier space stations and providing a dependable means of transporting crews into low Earth orbit. Soyuz TM-31 belonged to the Soyuz TM generation, which featured improvements in navigation, docking, and onboard systems compared with earlier versions. Its design included three principal sections: an orbital module providing additional space during flight, a descent module designed to return the crew safely to Earth, and a service module containing propulsion and supporting equipment. The spacecraft also fulfilled an essential safety requirement for permanent ISS operations. While docked, Soyuz could serve as an emergency return vehicle, allowing the resident crew to evacuate the station if a serious problem made continued habitation unsafe. Maintaining access to a suitable return spacecraft became a fundamental part of the ISS operating model. This capability was particularly important because the Space Shuttle, although able to transport larger crews and substantial cargo, could not remain docked indefinitely as an emergency escape vehicle. Soyuz therefore provided a complementary transportation system that helped make continuous occupation possible. ### Expedition 1 and the Challenges of Living in Orbit Expedition 1 was commanded by NASA astronaut William Shepherd, with Yuri Gidzenko serving as Soyuz commander and Sergei Krikalev as flight engineer. The three men brought extensive operational experience to a mission that demanded technical expertise, adaptability, and close cooperation between American and Russian space programs. Their first weeks aboard the ISS focused on turning the station into a functional workplace and living environment. The crew activated equipment, configured communications and life-support systems, unpacked supplies, and prepared the station for the arrival of additional modules and visiting spacecraft. These activities were essential because the ISS was still expanding, and its early residents had to balance routine maintenance with the demands of ongoing construction. Life aboard the station also presented challenges that would become familiar to future crews. In microgravity, ordinary activities such as eating, sleeping, exercising, and organizing equipment required specialized procedures. Astronauts needed regular physical exercise to reduce the effects of weightlessness on muscles and bones, while ground teams continuously monitored spacecraft systems and environmental conditions. Communication between the crew and mission controllers involved coordination across national organizations, languages, and technical procedures. Expedition 1 demonstrated that an international team could operate a complex orbital facility for months, establishing working practices that would support later crews. ### Building a Laboratory That Could Operate Continuously The importance of permanent ISS occupation extended well beyond the ability to keep astronauts in orbit. A continuously staffed station offered opportunities for scientific research that short-duration missions could not easily provide. Researchers could design experiments requiring extended observation, repeated measurements, and direct intervention by trained crew members. Microgravity research became one of the station’s defining purposes. Scientists could investigate how living organisms respond to prolonged weightlessness, how fluids behave without ordinary gravitational effects, and how physical and chemical processes change in orbit. Over time, the ISS supported investigations involving human physiology, combustion, materials science, plant growth, and other fields. Expedition 1 itself was primarily an activation and assembly-support mission, rather than the beginning of the station’s full scientific capabilities. Those capabilities expanded as additional laboratory modules, instruments, and facilities arrived in subsequent years. Nevertheless, the first resident crew established the operational foundation necessary for sustained research. The station also became an engineering testbed for technologies essential to long-duration spaceflight. Environmental control, water recovery, power management, spacecraft docking, and maintenance procedures could be evaluated through repeated use in an environment that could not be fully replicated on Earth. ### A Milestone in International Space Cooperation Soyuz TM-31 also represented a significant achievement in international cooperation. The ISS brought together the United States, Russia, Europe, Japan, and Canada in a long-term partnership requiring shared engineering standards, coordinated mission planning, and complex operational agreements. The presence of an American astronaut and two Russian cosmonauts aboard the first expedition symbolized a transformation in the relationship between two nations that had once competed intensely during the Space Race. By 2000, their space agencies were working together to maintain a shared orbital facility, combining different spacecraft, technologies, and operational traditions. This cooperation was not always simple. The ISS program faced budget pressures, scheduling difficulties, technical setbacks, and changing political circumstances. Yet the station’s multinational structure enabled participating agencies to contribute specialized capabilities while sharing the scientific and operational benefits of the project. The Expedition 1 crew demonstrated that international cooperation could function at the most practical level, with people from different countries living and working together in an isolated environment where their safety depended on coordinated decisions and mutual trust. ### Twenty-Six Years of Continuous Human Presence As the twenty-sixth anniversary of the Soyuz TM-31 launch arrives in October 2026, the mission’s legacy remains closely connected to the International Space Station’s extraordinary operational history. Since Expedition 1 entered the station on November 2, 2000, successive crews have maintained an uninterrupted human presence aboard the orbiting complex. During that period, the ISS evolved from a small collection of modules into a sophisticated laboratory and engineering facility. Crews conducted scientific investigations, supported commercial research, performed spacewalks, maintained aging equipment, and helped evaluate technologies relevant to future exploration missions. The station has also contributed to understanding the challenges of long-duration human spaceflight. Research into bone density loss, muscle deterioration, cardiovascular changes, radiation exposure, and other physiological effects has provided valuable information for planning missions beyond low Earth orbit. These findings are particularly relevant to future lunar exploration and potential crewed journeys to Mars, where astronauts may spend extended periods away from Earth and face greater limitations on emergency evacuation and resupply. The ISS has also helped establish a model for cooperation between government space agencies and commercial operators. As private companies develop new transportation systems and orbital destinations, many of the operational lessons learned through decades of ISS habitation continue to influence the next generation of space infrastructure. ### The Mission That Changed Humanity’s Relationship With Space The Soyuz TM-31 launch on October 31, 2000, did not mark the first time humans had lived aboard a space station. Earlier Soviet and Russian stations, including Salyut and Mir, had already demonstrated the possibilities of extended orbital habitation. Mir had even supported an uninterrupted period of human occupation lasting nearly a decade before its final resident crew departed in 1999. What distinguished Soyuz TM-31 was its role in beginning a new and enduring period of continuous human presence in space through the International Space Station. Its crew helped transform an unfinished orbital complex into a functioning home and workplace, establishing the foundation for decades of research, technological development, and international collaboration. The mission’s significance is measured not only by the successful launch of three space travelers but also by everything that followed: successive expeditions, expanding scientific capabilities, increasingly sophisticated spacecraft, and generations of astronauts learning how to live and work beyond Earth. **On October 31, 2000, Soyuz TM-31 began a journey that would change human spaceflight. Two days later, its crew opened the door to an era in which humanity would maintain a continuous presence aboard the International Space Station, turning the extraordinary achievement of living in orbit into an enduring reality.** ## Sources No external source is cited in this article. ## Sources No external source is cited in this article.