the swim. >> the next morning, she plunges into the ocean. with diana in the water, bonnie stoal assumes command. >> don't worry about it. this isn't the time for that. don't worry about it at all. >> one hour. >> best friend -- >> drill sergeant. >> on your first stroke, here you go. >> chief handler. >> bonnie is a rock. she is a professional athlete herself. she's a take charge, no-nonsense, say it in a few words. she knows me as an athlete. >> bonnie will lead an army of handlers that will follow dianas every stroke to nourish, encourage -- >> fabulous! >> and protect her. one of their biggest concerns, sharks. >> these are great waters for sharks. >> luke tippel is the team's lead shark diver. he knows just how dangerous these waters can be. >> catching this chum box hanging a tough back of the boat. >> these waters, we'll be looking for oceanic white tips, this animal has evolved to