If you look closely to the top of frame in the photo above, you'll see a couple of scuba divers. They're "cleaning the fish tank" while being circled by some pretty big sharks with very bad attitudes. They had a shadow boat with them the whole time. The bronze whaler shadowing the divers would be pushing 5 feet long.
What I like about this enclosure is that the sharks behave naturally and swim about as they please instead of doing circles like in all the other shark pens I've seen. It's fairly typical of the way Seaworld on the Gold Coast set up they're animal environments with lots of room for the animals to swim freely.