Nicknamed Pearl, the reptile was seen swimming around in the Adelaide River near Darwin on Sunday.
Diver John Craig had been spear fishing off the coast of Western Australia when the incident occurred.
Benjamin David, who lives in Munich, shuns public transport in favor of diving in to his local river.
Houston's Market Square Tower has a rather unique swimming pool that only the brave dare venture in to.
British swimmer Ben Hooper has embarked on a seemingly impossible feat of strength and endurance.
The remarkable stunt saw a man jump in to a pool filled with several thousand bottles of fizzy drink.
Swimmers have been urged to be on the lookout due to a rise in the number of blood-sucking sea lampreys.
A woman had to be rescued from the ocean after swimming for several hours in pursuit of a cruise liner.
Not all dolphins adhere to the species' friendly reputation as one man found out last month in Ireland.
Swimmers and sunbathers ran for cover as huge chunks of ice the size of golf balls rained down on them.
An abnormally large group of 100,000 dolphins has been sighted swimming off the coast of California.
Two Tamworth boars were filmed swimming a mile across the ocean in the north-west of Scotland.
Philippe Croizon will attempt a world record by being the first person with no arms or legs to swim the English Channel.
Officials in Queensland have alerted swimmers to keep out of the water after a giant shark was found almost bitten in tw...
Jon Downes examines a set of photographs he's received taken from a helicopter showing what appears to be an alligator o...
Lewis Gordon Pugh has raised eyebrows and made headline news around the world for his spectacular feats and remarkable r...