Built as Manly's Aquarium in 1962 and refurbished in 1988, Oceanworld was the first aquarium in Australia to have tube viewing. If you have ever wanted to swim with sharks, this is your opportunity! Oceanworld runs shark dives for certified divers, and for non-divers, including a short lesson. Dives are held in the evening, around three times a week, depending on numbers and must be pre-booked.