Breast cancer survivor's record-breaking swim

Ultra-marathon swimmer Sarah Thomas talks about going from her battle with breast cancer to her amazing swim across the English Channel.
6:06 | 10/02/19

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Transcript for Breast cancer survivor's record-breaking swim
All month long we're going to be sharing inspiring stories from survivors and ways to spread awareness for early detection. Today we'll meet a 37-year-old woman who just achieved the impossible, just two years after surviving an aggressive form of breast cancer. Take a look at her story. On the morning of December 17, 2017 Sarah Thomas emerged from the water a champion. 130-mile swim across the English channel. Swimming, battling strong currents Sarah accomplished a feat most couldn't dream. This wasn't even close to the biggest challenge of Sarah's life. At just 35 she felt a lump in her breast and was diagnosed with an aggressive form of breast cancer. Surgery, chemotherapy, radiation followed jeopardizing a promising athletic career she worked for her whole life. She powered through treatment. Just two weeks after completely radio therapy she was back in the water. A true testament to that grit and determination used to complete the historic four-way English channel swim. Please welcome ultra marathon swimmer and breast cancer survivor Sarah Thomas. Come on up. Come on in here. Oh, man. Welcome, welcome. Thank you. You are -- I was blown away at your story. The feat of swimming that length and being an ultra marathon swimmer, plus a survivor, where do you find your will to persevere? To swim that long it takes so much internal drive and motivation and thinking about all the people out there who have supported you and cheered for you during your journey, even before cancer. Speaking of cancer, what was that moment of diagnosis like for you? How did it affect your life? It was really hard. I just came off a really big swim. I was at the peak of my swimming career. I thought I could take on anything. Now I'm 35 with no family history of breast cancer. Now I'm a patient. I'm sick and I'm tired and it's soul breaking almost. I guess you were tested and you felt like you could overcome and you did. Totally tested. There are shocking statistics. 85% of women diagnosed don't have family history. My best friend also discovered by a self-examination, that's how you discovered yours. Yes. How important is that? It's so important to take care of your health as a woman. My oncologist actually told me my primary care doctor probably saved my life because she took me seriously. She didn't say get checked out later. Yours was aggressive. It was. You didn't have to do this alone. We saw your husband Ryan. He has a shirt that says I can't swim, which I thought was really funny. Ryan is here. He's in the front row. Oh, man, yes. Ryan, appreciate you being with us too, man. What was it look for you to watch your wife go through this journey? Man, it was really -- we were on top of the world. She set a record. Then getting devastated by -- getting diagnosed with cancer was devastating. It tore our world apart. Now she's back on top. It's really great to see. Very great. I mean, I'm watching that piece. I don't know how many of you are thinking to yourself swimming 54 hours straight. 54 hours straight! I can't stay up 54 hours straight. You have to love it. You do have to love it. I saw a big boat there. Were they cheering you on? How does that work? When you do a really long swim like that, you have a boat next to you that guides you so you don't have to worry about navigation. Your team is on the boat. They cheer for you, but also keep you hydrated and fed. What's the chalk-like stuff? Marathon swimming is very glamorous. Clearly. The white stuff is actually desitin. It's baby diaper cream. Is that to keep from getting chafed? It helps with sunscreen. It has a lot of zinc oxide in it and it's water proof. It's your sun protection. Okay. Learn something new. You put it on the little baby butt. You probably use tube after tube. I buy a big gallon bucket of it. We are so proud of you. Yes. Thank you for coming. We have a special gift for you. To keep you conquering everything along the way -- This is great. The only way Strahan, Sara or keke is hitting the English channel is through you. That is right. We need you to wear these. I know you're not done. You still got a lot of swimming left in you. Check it out. This should last you for a -- that will last you the next time you go across the English channel. A lot of desitin for you.

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

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