Finland's Johanna Nordblad claims under-ice freedive record
Herbert Nitsch, The Deepest Man On Earth - YouTube
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Freedive-graphic
Australian free diving record holder Adam Stern plunges deep into world championships - ABC News
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Deepest Free Dive – 253.2 m – 831 ft | Scuba Diving Halkidiki Greece
Deepest Free Dive: Join a sink in this blue hole!
She Dived More Than 300 Feet Under the Sea. Can She Go Deeper? - The New York Times
Herbert Nitsch - Wikipedia
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Scuba diving world records - DIVE Magazine
What are the deepest dives and world record of depth
