Jon Henricks set the 100-metre freestyle world record of 55.4 seconds at the 1956 Melbourne Olympics.
Notes on verification
Confirmed by multiple independent authoritative sources including Olympedia, ISHOF, Sport Australia Hall of Fame, and Wikipedia's world record progression table, with technical nuance about time-trial vs official records corroborated. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.574 clusters=5 claim_tier=notable | framework convergence=partial on Official Olympic/FINA competition records and historical swimming record-keeping (as compiled independently by Olympedia, Wikipedia's World Record Progression project, and various Hall of Fame archives) (upstreams: Olympedia, International Swimming Hall of Fame (ISHOF), FINA (world record ratification)) — publishers independent, evidence may not be | kind=empirical eligibility=high]
Sources
- The science games — ABC Science Archive (seed:sports_and_combat)
- https://www.olympics.com/en/athletes/jon-malcolm-henricks (corroboration)
- https://www.olympedia.org/athletes/45218 (corroboration)
- https://sahof.org.au/hall-of-fame-member/jon-henricks/ (corroboration)
- https://ishof.org/honoree/honoree-jon-henricks/ (corroboration)
- https://www.stateofswimming.com/happy-80th-birthday-lance-larson-sub-minute-butterfly-pioneer-who-triggered-the-timepad/ (corroboration)