Sea puppy – You may melt a little when encountering an Australian sea lion, also known as Labradors of the sea.
Australian sea lion – The largest remaining colonies of Australian sea lions are found on the islands of South Australia. Among them, Hopkins Island is the the most accessible destination to see the adorable mammal.
Whale Shark – Despite being the largest fish on the planet, the Whale Shark is a gentle swimming companion. South Ari Atoll, a ring of 120 sunny islets in the Maldives, is a regular hangout for these sea giants.
White shark – It's the stuff of nightmares for some, but encounters with the white shark can be as exhilarating as they are terrifying. Cage-diving expeditions for the brave are operated around the Neptune Islands -- a series of uninhabited islets 30 kilometers southeast of Cape Catastrophe in South Australia frequented by the sharks.
As wide as an RV – "The largest great whites are six meters long but it's their girth -- as wide as a van -- that took my breath away," says writer Ian Neubauer.
Humpback whale – The swimmers on a humpback whale tour can hold on a line about 100 meters away from the marine creature. It's then up to the whales to come over and say hello. Humpback whale tour operator Sunreef says so far all its tours have successfully spotted whales but only half of them got to swim with one.