A woman and the world's toughest swimming challenge: Ocean's Seven – alone through the most dangerous straits worldwide: from the English Channel to New Zealand's Cook Strait. After years of training, multiple world record holder Nathalie Pohl has fulfilled her big dream and became the first German woman to swim across all seven straits. She fights her way through marathon distances in the sea for up to 15 hours at a time – against strong currents and high waves, in shark waters, at night ...