The teams must brave the freezing cold water in an ambitious challenge that sees them work alongside research scientists who are studying the endangered Australian sea lion.
A detour has the teams explore the historic German town of Hahndorf as they must choose between slap of snag in a hilarious Bavarian bonanza.
The final three teams battle it out in the air, land, and sea as they race to the last pit stop near the 12 Apostles on the Victorian coast in the hope of winning the grand prize of $250,000.
When strong winds take a stunning hot air balloon ride off course, the teams brace themselves for the twists and turns of the ninth leg of the race.
The race accelerates to new heights when the teams must attempt an epic underwater helicopter escape challenge in one of the most terrifying tests of the race so far.
At the start of the day, the teams are left speechless when Beau reveals a shock twist that will change the state of play for the entire race.
Like castaways left at sea, the teams are left with only a simple treasure map and a cryptic message in a bottle to guide them towards the finish line at the sixth pit stop of the competition.
They might be in a tropical island paradise but it's not all sunshine and rainbows as the teams endurance is put to the test in an epic challenge of strength and resilience on a barge off the shore.
The teams take on new heights when they touch down in Townsville, where one team mate must conquer all fears and abseil down a 100 metre cliff face to capture the clue.
Seeking help from the locals for an iconic outback challenge - the dunny derby, their newfound friends must take their place on the 'throne' for a race across town.