The Men's 4×100 metre freestyle relay event at the 2008 Olympic Games took place on 10th and 11 August at the Beijing National Aquatics Centre. Because an Olympic size swimming pool is 50 metres long, each of the four swimmers completed two lengths of the pool. Two heats were held, with each containing the maximum number of teams . The heat in which a team competed did not formally matter for advancement, as the teams with the top eight times from the entire field qualified for the final; there, they all competed in a single final heat to earn final placements. A team could use... different swimmers in the final than had swum in the heats. There were 16 NOCs competing at this event. These 16 NOCs consisted of the 12 best placed teams at the 2007 World Aquatics Championships plus the 4 best times after the qualifying period. Prior to this competition, the existing world and Olympic records were as follows. The following new world and Olympic records were set during this competition. In the heats, the teams with the Top 6 times all swam past the previous Olympic Record; three of which swam faster than the pre-Olympic World Record.
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| Occurred: |
August 10, 2008 - August 11, 2008
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| Location: | Beijing National Aquatics Centre |