British swimmer Luke Greenbank disqualified from Paris Olympics after winning 200-meter backstroke heat.

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Disqualification due to swimming beyond 15 meters underwater at race start, violating World Aquatics rule.

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Greenbank expressed devastation and frustration, feeling "absolutely gutted" and "on good form

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Rule 15-meter rule applies to backstroke, butterfly, and freestyle events, but not breaststroke.

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Red buoys mark 15-meter point in each swimming lane to enforce rule.

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Greenbank won bronze in 200-meter backstroke at 2020 Tokyo Olympics and silver in 4×100-meter medley.

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Teammate Ollie Morgan progressed to semi-finals, while Greenbank's Olympic journey ended.

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Brazilian swimmer Ana Carolina Vieira also had Olympic journey cut short due to disciplinary issues.

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Vieira was sent home after leaving Olympic Village with teammate Gabriel Santos and reacting disrespectfully to punishment

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Greenbank's disqualification highlights importance of understanding complex swimming rules to avoid unexpected endings.

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