By car: The Dubai Aquarium & Underwater Zoo is located in The Dubai Mall, which is easily accessible by car.
By public transport: The mall is easily accessible by public transport. If you are using the metro, you can get off at the Dubai Mall/Burj Khalifa station and walk to the mall via the air-conditioned walkway. Once you arrive at Dubai Mall, you will need to walk through the mall to the lower ground floor (also known as LG).
By taxi: You can also take a taxi to the mall from anywhere in Dubai. It's a popular destination, and most taxi drivers will be familiar with the location.