To solve the Mystery in , you need to get a special item called the Rebreather. This tool allows Indiana to breathe underwater, but it is extremely expensive compared to other items you can buy. Because of its price, you have to find a way to collect enough money to purchase the Rebreather before you're able to use it.
There are several different kinds of currency you can collect throughout your adventures. The Rebreather costs Bones, a rarer type of currency a lot more uncommon than Pounds or Euros that may help you buy items from various vendors. The more Mysteries and side quests in you complete, the more collections of currency you'll build up as you progress the story.
The Rebreather is found in Sukhothai Village, an area you can reach naturally through the game's story. Once you arrive at this location, search for a vendor named Tongdang. After a brief cutscene introducing you to the vendor, he offers the Rebreather for an expensive 798 Bones, which is supposedly at a very generous discount.
You might have enough Bones to purchase the Rebreather right away, especially if you have completed enough missions and side quests, or located different treasures throughout your adventures.
Those who find Tongdang may be able to sell useless items in their inventory to get enough Bones, but some players may still come up short. Tongdang has other useful items for sale, but you'll want to save as many Bones as you can until you can buy the Rebreather first.
Anyone who doesn't have enough money for the Rebreather will begin an optional side quest called This local villain of Sukhothai has been terrorizing the Village, so no one would be disappointed if he were to lose all the gold they've stolen. Pursuing the Voss Fieldwork will get you more than enough Bones to buy the Rebreather, along with a few other items from Tongdang.
Do not worry about Tongdang selling the Rebreather to someone else, as the vendor holds it for Indiana after you express interest in it.
Completing
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