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Ku, Yun-Chieh
Jay Ku at Dean's Blue Hole in Long Island, Bahamas. Vertical Blue 2023, FIM Bronze Medal.
Personal information
Full nameJay Ku
NationalityRepublic of China (ROC)
Born (1987-12-06) 6 December 1987 (age 38)
Taoyuan, Taiwan
EducationMaster, National Taiwan Ocean University
Years active2021-present
Sport
SportFreediving
Achievements and titles
Personal bestFree immersion (FIM) -124 meters
Medal record
World Championships
Silver medal – second place AIDA World Championship (Roatán, Honduras 2022) CWT
Vertical Blue
Bronze medal – third place Bahamas 2022 FIM
Bronze medal – third place Bahamas 2023 FIM


Ku, Yun-Chieh (Chinese: 古雲傑,born December 6, 1987) is a Taiwanese freediver who has set multiple continental and national records in freediving.[1][2][3][4][5][6][7][8]

Records and medals

Year Discipline Competition Place Meters Record Medal
2021 Free Immersion (FIM) Vertical Blue Dean's Blue Hole, Bahamas, Long Island - 102 Continental Record / National Record
2021 Constant Weight with Monofin (CWT) Vertical Blue Dean's Blue Hole, Bahamas, Long Island - 102 Continental Record / National Record
2021 Constant Weight with Bi-Fins (CWTBF) Vertical Blue Dean's Blue Hole, Bahamas, Long Island - 90 Continental Record / National Record
2022 Free Immersion (FIM) Vertical Blue Dean's Blue Hole, Bahamas, Long Island - 108 Continental Record / National Record Bronze medal
2022 Constant Weight with Monofin (CWT) Vertical Blue Dean's Blue Hole, Bahamas, Long Island - 108 Continental Record / National Record
2022 Constant Weight with Bi-Fins (CWTBF) Vertical Blue Dean's Blue Hole, Bahamas, Long Island - 96 Continental Record / National Record
2022 Constant Weight with Monofin (CWT) 29th AIDA World Championship Roatan, Honduras - 105 National Record Silver medal
2023 Free Immersion (FIM) Vertical Blue Dean's Blue Hole, Bahamas, Long Island - 108 National Record Bronze medal
2024 Constant Weight with Monofin (CWT) 8th CMAS Freediving World Championship Kalamata, Greece - 102 National Record
2024 Free Immersion (FIM) 8th CMAS Freediving World Championship Kalamata, Greece - 103 Continental Record / National Record
2024 Constant Weight with Bi-Fins (CWTBF) 8th CMAS Freediving World Championship Kalamata, Greece - 91 National Record
R:[3][4][5][6][7][8][9][10][11][12][13][14]

Personal bests

Personal best
Year Discipline Competition Places Meters
2023 Free Immersion (FIM) Vertical Blue Dean's Blue Hole, Bahamas, Long Island - 124
  1. ^ "Jay Ku - Freediving Depth - Day 4 Freediving World Championship Depth 2024 - Athletes Performances". Confédération Mondiale Des Activités Subaquatiques. 7 October 2024.
  2. ^ "Jay Ku - Freediving Depth - Day 8 Freediving World Championship Depth 2024 - Athletes Performances". Confédération Mondiale Des Activités Subaquatiques. 11 October 2024.
  3. ^ a b Liang, John (18 July 2021). "Another Monster Day of World Records On Day 4 Of Vertical Blue 2021". Deeper Blue. Archived from the original on 29 April 2025.
  4. ^ a b Liang, John (17 July 2021). "Alice Modolo Sets New World Record On Day 5 Of Vertical Blue 2021". Deeper Blue. Archived from the original on 28 December 2024.
  5. ^ a b Whelan, Stephan (7 August 2022). "Vertical Blue 2022: Day 5 – Six New National Records and a Continental Record". Deeper Blue. Archived from the original on 28 December 2024.
  6. ^ a b Liang, John (11 August 2022). "Vertical Blue 2022: Day 8 – Bi-Fins Continental Record Battles". Deeper Blue. Archived from the original on 28 December 2024.
  7. ^ a b Liang, John (12 August 2022). "Vertical Blue 2022: Final Day – A Second World Record For Mateusz Malina". Deeper Blue. Archived from the original on 28 December 2024.
  8. ^ a b Liang, John (31 July 2023). "Vertical Blue 2023 Day 9: Pedro Tapia and Fatima Korok Take Overall Gold". Deeper Blue. Archived from the original on 28 December 2024.
  9. ^ "AIDA | Ranking". AIDA International. 8 July 2025.
  10. ^ "News | VERTICAL BLUE". Vertical Blue. 8 July 2025.
  11. ^ "World Underwater Federation - Quality in diving". Confédération Mondiale Des Activités Subaquatiques. 8 July 2025.
  12. ^ Liang, John (8 July 2025). "Four World Records Set On Day One At Vertical Blue 2021". Deeper Blue. Archived from the original on 29 April 2025.
  13. ^ Stephan, Whelan (8 July 2025). "Video: Exciting Second Day of Vertical Blue 2021 With More Freediving Milestones". Deeper Blue. Archived from the original on 29 April 2025.
  14. ^ Liang, John (3 August 2022). "Vertical Blue 2022: Day 2 – Alice Modolo Grabs A New World Record, Plus 6 National Records Set". Deeper Blue. Archived from the original on 28 December 2024.