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South Africa is well known for its gold reserves, but something more valuable has now been discovered - helium.
Helium is used to blow up party balloons, but it's also an important technological component in medical scanners, microchips and space exploration.
However, it's produced in fewer than 10 countries in the world.
Roughly 10 years ago, South African natural gas company Renergen bought an enormous site of 87,000 hectares - for the tiny sum of $1.
Natural gas often includes small amounts of helium.
However, when the gas from this area was analysed, they were shocked to find so much helium.
Stefano Marani was particularly surprised.
Finding helium in the first place was incredible.
But the actual level of helium was far higher than expected, by comparison with other countries.
Renergen believes they may own 9.74 billion cubic metres of helium, which is considerably more than the present US supply.
If this is so, it's estimated to be worth over $100 billion.
Production could well be the greenest in the world because removal will be simple.
It'll certainly be interesting from an engineering and scientific point of view.
