What are the odds of a persona successfully swimming across the

the odds are 1:infinity

I think people have swam the English Channel, so it's possible if the distance is short enough.

The human body just doesn't have enough energy to actually make that journey. You'd die of thirst, starvation, hypothermia, or just drown before you even make it close to halfway.

>>7958825
this. swimming consumes a fuckton of calories. the people who swim the english channel lose like 14 lbs in the process.

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>>7958189
This guy swam the English Channel when he was one, so it's definitely possible and pretty easy actually.

>>7958161
https://en.wikipedia.org/wiki/Diana_Nyad

Swam from Florida to Cuba without a shark cage

>A desperate Syrian refugee has revealed how he braved massive waves and deadly currents to swim for seven hours to reach Greece from Turkey.
http://www.independent.co.uk/news/world/europe/syrian-refugee-ameer-mehtr-swims-for-7-hours-to-start-new-life-in-europe-a6781276.html

>Hesham Modamani looked out at the sea separating him and his dream of getting to Europe, the continent that could finally free him from the horrors back at home in Syria. The 24-year old felt nervous. Modamani couldn't afford to pay the $1,350 ticket for a smuggler to ferry him across the channel between the coast of Turkey and the nearest Greek island.
http://edition.cnn.com/2015/09/14/europe/europe-refugee-crisis-swimming-to-freedom/

>Two men did the near-impossible: swimming nearly 5 miles to reach Europe, after fleeing war.
http://edition.cnn.com/videos/world/2015/09/14/syrian-refugees-swim-to-europe-orig.cnn/video/playlists/refugee-stories/

>>7960588
>>7960617
None of these are big enough to be considered oceans. Treading 5 Miles of water is nothing.

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>>7958161

If they have protection from hypothermia, and a PFD, they could technically cross one of the oceans of Earth, but it totally depends on which ocean. It also completely depends on where they plan on swimming from and to, cause ocean currents would make it basically impossible if they try to go against it. This is also not including the fact that they would die from dehydration or others biological issues.
This doesn't even include the lack of food, or the mental strain, as there would be nothing to do but swim/float for weeks most likely.

basically don't even try