The 48-meter walk-through Tunnel provides 270-degree views from 11 meters below the surface of the tank.
No, it will incur additional charges.
There are several tickets/packages/experiences available including; Basic/Standard/General, Penguin Cove, Ultimate, Explorer, etc. Basic includes access to Aquarium Tunnel & Underwater Zoo only.
Several encounters including; Penguin Encounter, Ray Encounter, King Crocs Encounter, Otter Encounter, Shark Trainer Encounter, etc. can be done at an additional cost.