Ocean Journey, a 60,000 square foot structure equivalent in height to a ten-story building, opened in 2005 and contains a total of 700,000 US gallons (2,600,000 L).
It ostensibly follows the theme of the River Journey by following the river into the Gulf of Mexico.
This facility includes hyacinth macaws, a touch tank of small sharks and rays, and a butterfly garden with free-flying South American species.

Major exhibits in Ocean Journey include:
The Secret Reef, the largest tank in Ocean Journey (and the Tennessee Aquarium), containing 618,000 US gallons (2,340,000 L).
 It depicts the environment of the Flower Garden Banks National Marine Sanctuary in the Gulf of Mexico and can be viewed from three levels including the Undersea Cavern, an underwater walk-through feature.
 The species exhibited in the Secret Reef include sand tiger sharks, bonnethead sharks and green sea turtles, one of which, Oscar, is a rescue animal missing much of its rear flippers due to injuries from a boat and a predator.

The Boneless Beauties and Jellies: Living Art galleries, which exhibit invertebrates including corals, jellyfish, cuttlefish, giant Pacific octopuses, and Japanese spider crabs.
Jellies: Living Art is a collaboration with the nearby Hunter Museum of American Art and includes rotating exhibits of art glass alongside the jellyfish.

Penguins' Rock, which displays macaroni penguins and gentoo penguins onshore and swimming in a 16,000-US-gallon (61,000 L) tank.
Ocean Journey, a 60,000 square foot structure equivalent in height to a ten-story building, opened in 2005 and contains a total of 700,000 US gallons (2,600,000 L). It ostensibly follows the theme of the River Journey by following the river into the Gulf of Mexico. This facility includes hyacinth macaws, a touch tank of small sharks and rays, and a butterfly garden with free-flying South American species.
Major exhibits in Ocean Journey include:
The Secret Reef, the largest tank in Ocean Journey (and the Tennessee Aquarium), containing 618,000 US gallons (2,340,000 L).  It depicts the environment of the Flower Garden Banks National Marine Sanctuary in the Gulf of Mexico and can be viewed from three levels including the Undersea Cavern, an underwater walk-through feature.  The species exhibited in the Secret Reef include sand tiger sharks, bonnethead sharks and green sea turtles, one of which, Oscar, is a rescue animal missing much of its rear flippers due to injuries from a boat and a predator.
The Boneless Beauties and Jellies: Living Art galleries, which exhibit invertebrates including corals, jellyfish, cuttlefish, giant Pacific octopuses, and Japanese spider crabs. Jellies: Living Art is a collaboration with the nearby Hunter Museum of American Art and includes rotating exhibits of art glass alongside the jellyfish.
Penguins' Rock, which displays macaroni penguins and gentoo penguins onshore and swimming in a 16,000-US-gallon (61,000 L) tank.
Tennessee Aquarium