If you've been trekking through the muddy jungles of Thailand in Indiana Jones and the Great Circle, you've probably stumbled into Voss’ Camp. It's a nasty place. Full of soldiers, restricted zones, and that oppressive 1937 atmosphere that MachineGames nails so well. But tucked away in a southeast tent is something that’ll drive a completionist crazy: the Indiana Jones and the Great Circle serpent's chest.
It’s an unassuming box with a snake carved on the lid. Locked tight.
Beside it sits a letter from Voss himself. He’s frustrated. He found the thing in Gizeh, but he can’t open it. To do what he couldn’t, you've basically got to embark on the game's only globe-trotting side quest. This isn't just a "walk five feet and find a key" kind of deal. It’s a multi-region scavenger hunt that spans the Vatican, Egypt, and China.
Honestly, most players walk right past it because the game doesn't force you to look at it. But if you want those 250 Adventure Points and the 100% completion stat, you’re going to need a very specific piece of gear and a lot of patience for backtracking.
How to Get Started in Sukhothai
You can’t even begin this Mystery properly until you reach the Sukhothai region. Once you’re there, head to Voss’ Camp. It’s easier if you’ve already snagged the Royal Army Uniform—walking around in a disguise makes the search way less of a headache.
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The chest is in a green tent in the southeast corner. Read the letter on the desk. This triggers the Mystery and officially adds the goal to your journal.
Pro Tip: Don't even bother leaving for the keys until you have the Rebreather (the Breathing Device). You buy this from Tongdang’s Hut. It’s expensive, so you might need to finish the "Voss' Gold Stash" Field Network first to build up your wallet. Without it, the keys are physically unreachable.
Tracking Down the Three Ancient Keys
Once you have the Rebreather, you have to use the "Travel" tab in your map menu. You’re heading back to places Indy has already been. It feels a bit like a victory lap, only with more swimming.
The Vatican Key: Under the Excavation
Fast travel back to the Vatican and head for the Excavation Site in the southeast. You’re looking for the Tower of Nicholas V area, specifically the room where the bulldozer crashed through the floor.
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- Go down into the flooded lower section.
- Equip your Rebreather and dive into the water.
- Look for a wooden log or beam blocking a hole in the wall.
- Move it, swim through, and the Ancient Vatican Key is sitting there waiting.
The Gizeh Key: The Khentkawes Dig Site
Next stop, Egypt. Go to the Khentkawes Excavation. You don’t need to take the big elevator down to the bottom this time. Instead, follow the blue power cables near the generator.
There’s a room partially submerged in water. Again, jump in. To the right of the main path, there’s a flooded doorway. Dive down, find the log blocking the gap, and move it. The Ancient Gizeh Key is on a small pile of sand inside that hidden room.
The Shanghai Key: The Canal
This one is arguably the most annoying because of the map layout. When you return to Shanghai, the game often spawns you at the end of the level. You have to backtrack all the way to the beginning, near where the plane crashed.
Look for the canal near the broken bridge. Jump in the water and head toward the far corner. There’s one last wooden beam to move underwater. Behind it, you’ll find the Ancient Shanghai Key.
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What’s Actually Inside the Serpent’s Chest?
After you’ve done all that traveling, head back to Sukhothai. Go back to that same tent in Voss’ Camp and interact with the chest. Indy will slot in all three keys, the locks will click, and the lid pops open.
The Reward:
- 250 Adventure Points
- One Ancient Relic (categorized under Sukhothai collectibles)
I’ll be real with you: some players find the reward a bit underwhelming. If you were hoping for a secret weapon or a new whip upgrade, you won't find it here. However, for those trying to unlock every skill in the game, those 250 Adventure Points are a massive boost.
Moving Forward with Your Adventure
Now that you've cleared the most time-consuming side quest in the game, you can focus on the remaining Fieldwork.
- Check your Journal: See if you’ve missed any other "Sukhothai Mystery" entries, as this region has some of the trickiest hidden puzzles in the game.
- Spend those Points: 250 points is enough to buy some high-tier upgrades. If you haven't picked up the "True Grit" or "Quick Draw" skills yet, now is the time.
- Find the Relics Book: If you're still missing other relics in Thailand, head to the ruins northwest of Voss' Camp (past the elephant statues) to find the book that marks all relic locations on your map.
Getting the Indiana Jones and the Great Circle serpent's chest out of the way early in your Sukhothai exploration is the best move. It clears the map and lets you focus on the main story without feeling like you left unfinished business halfway across the world.