In this episode of Blue World, Jonathan visits Holly Martel Bourbon, the Dive Safety Officer (DSO) at the National Aquarium in Baltimore, Maryland to learn about the job of a DSO. And together they dive in the Atlantic Coral Reef exhibit, and meet many of the fishy inhabitants of this 335,000 gallon salt water aquarium, including a bonnethead shark, hogfish, skates, rays, puffers and moray eels!