Man attempts record-breaking swim across Pacific Ocean

Ben Lecomte, 51, plans to swim eight hours a day for six months across 5,500 miles, from Tokyo to San Francisco.
2:01 | 06/05/18

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Transcript for Man attempts record-breaking swim across Pacific Ocean
We are back now with the swimmer diving into theac ocean and going for a sw, but his swimming is going for six months tring all the way from Tok to S Francisco. He kicked off hisrney overnight and spoke with us just before taking the plunge. ABC's gio Benitez is here gio, this isn't the first ocean the's crossed. It's not, ael. Odning to Yo listen 'the 8 he swam acros the atla from Massachusetts nce but the pacific has none before and for GHT hours a day he'll be in ter swimmi more tha5,000 miles. This morning, the swimmer who already conquered the atic 20 years ago begins a truly un124iable swim. The H seas O the pacific from Tokyo San francisco.overnight ginning H swim off the coast of japannd broadcasting onacebookve. There we go. Reporter: Ben beginning swim side by side with hiswo children speaking with us just moments before taking that plunge. Ore than one challenge. On the O the have th water. Reporter: Lecomte's journey 5,500 mile 6 month, 8 hours a day a time. I haveoat 8,000 calories per day I I don't eat it qui a bit of weight so that' challenge as well. Orter: Heaces incredible obles. The ocean's top predators and giant patches of garbage, much of which help study fcientific research. Ant's be honest, O of the first things you wonderabout, what about sharks? Asked. He says he loo forward T seeing them because there are fewer and fewer of them. You know what H really afraid of jellyfish. I'd be afraidf T sharks too. D of everything, right. The re trip is going to be donted, right? A crew of six I sailing alide him shootin this for a documentary for him. He did the first trip he was 30. This one is 50 T's the beauty O swimming. You can do it at any age. Thank you. We'll be watching.

This transcript has been automatically generated and may not be 100% accurate.

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