For decades, the idea of swimming in Baltimore's Inner Harbor was unthinkable. Polluted, filled with trash, sewer runoff making it unsafe for human contact. But on a sunny day in June, dozens of Baltimoreans took the plunge into the harbor's waters, marking a dramatic turnaround in the city's aquatic history. Today, we'll dive deep into the harbor's transformation, meeting the visionary team that turned this dream into reality and learning the science behind the cleanup. We'll also hear the story of Katie Pumphrey - the first person to swim the 24 mile stretch from the Bay Bridge to Baltimore's Inner Harbor.

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