S1, E4: In Darwin, the team races against time to complete the waterproofing of the Mudcrab. With just seven days left, they work tirelessly on the fully electric vehicle, conducting underwater tests to gather vital data. The Mudcrab faces challenges such as an underwater dunk test and shoreline driving to ensure feasibility. As the team prepares for the world record attempt, an unexpected obstacle arises: they are prohibited from crossing two underwater gas pipes. In a nail-biting finale, Luke and Taylor take on the 7km underwater drive and continue Tim Proctor's 40 year old legacy.