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No Man’s Sky's underground treasures will make you rich

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Grab your grenade launcher. It's time to go spelunking.

There's more to the planets of No Man's Sky than what you see on the surface. If you look carefully, you can find vast underground cave and tunnel networks, full of useful resources. In this guide, we'll tell you how to find them, teach you about the loot you can expect to see inside — and tell you how you can use your loot to get rich.

When you're walking around a planet, watch for clusters of resources that seem to be under you. Position yourself above them and aim your Multi-Tool at your feet. Using the Grenade launcher Companion Unit, you can start excavating your way down.

These caves tend to be filled with Plutonium. While you can luck into a big cluster of Plutonium on the surface from time to time, finding a cave system will quickly fill up your inventory with this valuable fuel. In the video above, we found eight inventory slots full of Plutonium in less than five minutes — that's 2,000 pieces.

We've already written about using Plutonium and Iron to make Bypass Chips to turn into cold, hard cash. This is a great way to stock up on your ingredients. If you find the recipe for Unstable Plasma, you can craft the near-infinite Thamium9 you gather from asteroids and your new wealth of Plutonium into something that sells for 27,500 units apiece.

Would you like to know more?

No Man's Sky is a largely solitary experience, but that doesn't mean you have to travel the universe alone. This is but one small section of Polygon's No Man's Sky guide.

Be sure to check out the rest, where you can learn all about your ship, your Multi-Tool and Companion Units and even get answers to some of the biggest questions about No Man's Sky. We also have a guide to No Man's Sky's resources that'll teach you the difference between Oxides and Silicates and No Man's Sky's various elements.

If you're just looking for a quick reference guide to locations— like where you can save and trade — we've got you covered, too.