Only about 35% of Americans know how to swim, and only 2% to 7% swim well, Osinski says.

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"I thought, oh wow she really doesn't know how to swim, despite what everyone thinks, " says Ms. Rothenhaus.

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Maria , because as I understand it you don't know how to swim.

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"I don't know how to swim, but somehow I made it to shore, " she recalled in a teleconference with reporters this week.

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They're just much faster. (Laughter.) And I know how to swim -- they just swim much better than I do.

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Correct, I do not know how to swim.

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"My sister was not a swimmer and did not know how to swim, and she would never go to another boat or to shore dressed in a nightgown and socks, " said Lana Wood, referring to theories that the actress may have voluntarily jumped from the boat, last year.

CNN: January 15, 2013 -- Updated 1645 GMT (0045 HKT)