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She carried the Olympic torch along with 23 other para-taekwondo athletes.
Ankita Bhakat bagged the 11th spot with a season-best score of 666, Deepika Kumari settled for 23rd place.
The five Olympic rings are now displayed on the south side of the Eiffel Tower.
The opening ceremony will take place on the River Seine with athletes on barges floating past hundreds of thousands of spectators in one of the most anticipated events of these Games.
The ceremony is due to start at 7.30 pm (11 pm IST) on July 26 and last just under four hours.
Last Saturday's assassination attempt against former US president Donald Trump at an election rally in Pennsylvania has not changed the security plans for the Games.
Hidalgo took the plunge around 10 am on a glorious summer's day in Paris, with visitors crowding on nearby bridges to catch a glimpse of her after several postponements due to heavy rain and doubts about water quality.
The 20-year-old, who was born with a partially paralysed right arm and has dyslexia, is part of a 24-member para-taekwondo contingent that will carry the Olympic torch in Gennevilliers on July 24.
Oudea-Castera was filmed by BFM TV as she briefly swam in the Seine near the Alexandre III and Invalides bridges.
Vogue World has said it will donate one million euros to the charity, French Popular Relief, which tackles poverty and discrimination from the proceeds.