We got a free entrance into the aquarium after eating at the Cargo Hold restaurant (see separate review).
There were only a few other people in the aquarium at this time, so viewing the exhibits was very pleasant compared to other times I have been where you couldn't get near some of the tanks because of the crowds.
The sound effects and the design of the aquarium is stunning and little touches inside the exhibits, like crockery, chandeliers etc, make it feel like a ship wreck.
On the downside, which is why I didn't give it 5 stars was that whilst we were waiting for some of our family to catch up, we waited at the closed coffee shop. We could see all the equipment and the coffee machine had cockroaches running around on the INSIDE, then a large mouse/rat ran across the floor and under the food counter. Somebody had also vomited on the floor and nobody had bothered to clean it, which is quite gross.
I hope they sort out their "wildlife" problem as they are going to get sick customers if they don't.