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To put your mind in a state where you consider its only one day of your life. you will, eventually, if you move one arm in front of the other, you will get to the other side. and six hours later, ahead of time, andy and his support boat were spotted from clevedon beach. an incredible achievement — but andy is using this swim as training for an even bigger challenge. yeah, i've persuaded myself that this is a seven hour training swim in preparation for a much longer swim in cold water up at loch ness in about six, seven weeks' time. it's about 23 miles. it's cold, it's about 12 degrees, and i...

Kicks into high gear. the team flies in. the boats are prepped. and then just hours later, the forecast turns. and the weather window vanishes. >> that put everything to a halt. it was a setback for many, a chance to improve things for others on the crew but diana got to have her very first meltdown, which she needed to have. >> i just bawled like a baby. for me it's like will this ever happen? >> diana decided to turn it to her advantage. she takes the team out for a training swim. her goal, to work out a few kinks. >> we're ready. 7:40 in the water, okay? >> like her difficulty swimming in a...

>> turns out even elite athletes sometimes lose their luggage. >> thank you, thank you. >> good luck to you in finding your bag. that will probably be harder than swimming from cuba to florida. >> now everything in key west kicks into high gear. the team flies in. the boats are prepped. and then just hours later, the forecast turns. and the weather window vanishes. >> that put everything to a halt. it was a setback for many, a chance to improve things for others on the crew but diana got to have her very first meltdown, which she needed to have. >> i just bawled like a baby. for me it's like w...

She's entering a very hostile environment. >> dr. ken camler is a surgeon that specializes in extreme medicine and knows exactly what diana's body will go through. >> she won't be able to keep up the energy and heat loss she'll be experiencing. >> impossible to do that? >> impossible to do that. the water is going to drain her, so she's going to be running at a deficit. as time goes on, the deficit will increase and she'll just be providing energy to those organs essential for survival. she's swimming alone, but she's in a race. she has to swim to florida before the point to where her body det...

>> dr. ken camler is a surgeon that specializes in extreme medicine and knows exactly what diana's body will go through. >> she won't be able to keep up the energy and heat loss she'll be experiencing. >> impossible to do that? >> impossible to do that. the water is going to drain her, so she's going to be running at a deficit. as time goes on, the deficit will increase and she'll just be providing energy to those organs essential for survival. she's swimming alone, but she's in a race. she has to swim to florida before the point to where her body deteriorates to the point where she can no lon...