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Watch Building The Biggest online: Episode 4 International Space Station

Four hundred kilometres above the Earth, a remarkable structure is taking shape. This is the International Space Station, a vast orbiting laboratory whose construction has been hailed as the most ambitious feat of engineering in human history. The space station, a collaboration between 15 countries, is being assembled piece by piece. More than 50 missions, mostly by the shuttle, will be needed to transport and assemble all the components.

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