Czech freediver David Vencl has set a new World Record for Men's Swimming Under Ice under 12" of ice wearing nothing but a Speedo. David swam 80.9m under a frozen lake to break the previous record.

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Sources

https://www.cbc.ca/sports/czech-swims-nearly-length-of-football-field-under-ice-to-set-new-world-record-1.5924315