Adventure & Extreme - 4 free documentaries about sailing & ocean racing.
Start with Sailing Faster Than The Wind - How Is That Even Possible? (13 min, Steve Mould), then Super Yachts: Building World's Most Technologically Advanced Yachts (48 min, Free Documentary). All 4 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on sailing & ocean racing is Sailing Alone Around the World by Joshua Slocum.