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Şahika Ercümen was born in Çanakkale in 1985.
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In 2006, at the Freediving World Championships in Tenerife, Spain and broke the Turkish record.
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She came fourth in Europe at the Free Diving European Championships.
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She broke the world record for Underwater Horizontal Diving.
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On July 22, 2014, she became the CMAS world record holder by reaching 91 meters in a dive with variable weight without fins in Kaş district of Antalya province.
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On October 26, 2021, Şahika Ercümen set a CMAS world record by diving to 100 meters in the variable weight category without fins in Kaş, Antalya.
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On the 100th anniversary of the Republic of Turkey, Şahika Ercümen set a Turkish record by diving 100 meters in 3 minutes and 14 seconds at the Blue Pit in the Bahamas.