Without water, little progress is made on Australia's Palmer River Goldfields. So treasure hunter Mat had to move his wash plant to another location. That cost time and money because there was no income during the move. Fortunately, the gold digger can also rely on his buddy Andreas in this situation. The German adventurer makes his way down under to help his friend. And because Mat's mine is now designed for three workers, Andreas wants to bring his 19-year-old son Tobi with him.

Tobi was able to follow his father to Northern Queensland after the operation in Germany. And the wash plant works non-stop. That is why the gold diggers are optimistic about the future. But then Tobi sets off into the bush with a detector to look for nuggets there. The 19-year-old loses his bearings in the wilderness. And the next day, the investor announces himself on the phone. The first repayment is due. Can the adventurers get the missing 30 ounces of precious metal in time?

The investor wants to see gold? Precious metal that Mat does not yet have. That's why the adventurer has only one thing left: he has to improvise! Creative ideas are called for when searching for treasure on the Palmer River Goldfields. And the night before Mark leaves, Mat fires up the furnace. Every ounce, every nugget, every grain of gold that he has unearthed with his German buddy and his son Tobi in the last few weeks is melted and poured into bars. And then comes the moment of truth: is the investor satisfied with the result?

The Palmer River driveways are flooded. Mat and Andreas cannot do anything there. That's why the adventurers head south. Because a friend of Mat's recently found a giant nugget near Charters Towers. However, a surprise awaits the men at the meeting point: the precious metal comes from a huge cattle farm. And you can't just unpack your gear and prospect for gold on private property because that would be illegal. Therefore, in this case, nothing goes without the permission of the owner.

Two men, one mission. Mat and Andreas are good friends and they share a great passion: searching for precious precious metals! In the Australian outback, the men are hoping for the really big find. But the wilderness does not reveal its treasures without effort - this is especially true in the rainy season. That's why the duo has to fight for every ounce with heavy machinery Down Under. And the hard work on the Palmer River Goldfields doesn't get any easier with an investor behind you. On the contrary: because the investor wants to see results. Will professional treasure hunter Mat and his German buddy fulfil their dream of huge nuggets in season four?

For 130 years, the hope of fame and fortune has drawn intrepid adventurers like Alex Stead to Western Australia. The Brit has leased a 1,200-hectare piece of land in the outback to dig up fat nuggets. His father-in-law Eric and his best friend Jimbo help him on the treasure hunt. But the men are stuck on schedule. The team's new processing plant should have been up and running five weeks ago. Is there enough time left until the end of the season to achieve the goals they have set?

Andreas and his son Tobi have returned Down Under to celebrate Mats' birthday in Longreach. The trip becomes a journey into the past, because in the birthplace of the gold digger, 1500 kilometres south of Cairns, the German adventurer Mat gets to know old buddies from their teenage years. And after the party, it's off to Treasure Hunting. The men in the state of Queensland are not after fat nuggets, but rather relics from Australia's history, such as coins from the 19th century.

Mat invests in a new business in Australia. The adventurer wants to dig up opals Down Under with his buddy Andreas and his son Tobi. The first search for clues was promising, which is why Mat acquired prospecting rights in the outback. But the plan is risky, because the men cannot rely on metal detectors and proven technology when searching for the precious gems. Treasure hunting requires a good nose and years of experience. Will the beginners learn the hard way or will the company be a success?

Andreas is on his own in the search for opals because Mat has injured his wrist. Is the investment in the new mine still paying off? At Forsayth, the adventurers then aim for valuable precious metal. A four-ounce nugget was recently unearthed there. But the goldfields are huge, so the local men get involved in a shooting competition. If they lose, they will have to give up their beloved metal detector. But if they win, the gold digger will tell them the exact location.

Farm instead of gold mine: Matthew Vaughan visits his best friend in Germany. On Andreas Macherey's farm, the men take care of his highland cattle. But the gold digger from Down Under is not used to winter temperatures around freezing. That's why Mat is drawn back to the Australian bush. In order to increase his income, the treasure hunter wants to complete a large wash plant there. And Andreas also has his hands full in the Eifel. "Big Foot" or the giant barn? Who will put their project into action first?

Mat has bills to pay in Australia. Two fat nuggets are just what he needs. The find eases the financial situation of the treasure hunter a little. But the lucky streak doesn't last long. Down under, the gold digger nods off at the wheel of his SUV and crashes the vehicle into an embankment. Although Mat is only slightly injured in the accident, his off-roader is completely destroyed. Meanwhile, Andreas is expanding his machine park in the Eifel region and is looking for precious metals in a friend's gravel works.

After an accident in Australia, Mat tows away his wrecked SUV. The treasure hunter Down Under is supported by his brother Rhien and the experienced bush trucker Steve. But the campaign is not a sure-fire success. The truck carrying Mats Off Roader to the Palmer River camp gets stuck in deep sand. And Andreas wants to bring precious metal to light in a gravel plant in Germany. For this he needs the right equipment. Andreas' buddy Kai designs the largest gold panning facility that has ever been built in this country.

The wash plant is ready. Andreas wants to use the dredge to search for precious metals in a gravel works in Germany. But does the machine keep what it promises? And does it create enough negative pressure to suck stones and soil out of the rivers in Australia? The first endurance test is sobering. Meanwhile, Mat and his brother Rhien roll up their sleeves on a goldfield on the Palmer River. The men Down Under are rewarded with a few nuggets for their efforts. But the yield is not enough to settle all outstanding accounts.

The self-made dredge does not yet work 100%. But it might be enough for a treasure hunt in a German gravel plant. However, Andreas has to develop a new technique to separate the precious metal from the sand. Mat, meanwhile, heads to the outback with his brother Rhien and his buddy Paul to dig up fat nuggets. And what about "Big Foot"? If the Australian gold digger can finish his wash plant faster than Andreas can finish his barn extension, he gets his beloved SUV back.