One of Australia's largest hydro power stations undertakes a high stakes valve replacement; they have six hours to get the 800kg replacement part down six stories.
The Kooragang Coal Terminal is buzzing with the arrival of a newly designed Ship Loading Spout and Trimmer Flap.
In Central Queensland, the army mechanics from the 2nd/14th Light Horse Regiment have two hours to overhaul a tank suspected of hoarding unwanted debris.
The mechanics at Brisbane's Gallipoli Barracks's Light Horse Regiment aim to complete two huge tasks.
The team at Murray 1, Snowy Hydro's second-largest power station, reassemble a massive power turbine after they find extensive cracking in the top cover.
A week-long mechanical marathon for the team of Queensland Rail mechanics, as they work to hoist a six-tonne V12 engine.
The team from Lindores Construction Logistics have one day to relocate a massive tower crane on the Queens Wharf development in Brisbane.
South of Jindabyne, a mini hydro station has long-awaited repair work done, thanks to the arrival of a brand new submerged discharge valve.
Tensions are high at the Gilmour Space Technologies test facility on the Gold Coast, where the team prepares to put their brand new rocket through its second test.
In Sydney, Leichhardt Bus Depot, one of the largest in the Southern hemisphere, the team has to scramble to repair two buses before the morning rush hour.