How to unlock and complete the Hydrological Investigation in The Chasm World Quest in Genshin Impact

The Hydrological Investigation in The Chasm is a World Quest that can be initiated by fishing up a Strange Object from the Underground Waterway. You can start doing the quest after unlocking the Underground Mine through The Chasm Spelunkers World Quest.

To start, head to the area circled in the image below. You can get there by starting from the Teleport Waypoint south of The Chasm: Main Mining Area. Go through the cave beside it and keep following the path along the cliffs.

Once you get to the location above, you'll find a fishing spot. Your goal is to keep fishing until you get the Strange Object. This could take quite a few tries if you're unlucky, so make sure to change the in-game time between day and night to spawn all the possible fish in the area. If you don't get it within the day, try again in three days, as all the fish would respawn then.

Make sure to double-check your Quest Item Inventory, in case you already fished up the Strange Object previously. After getting the item, head to the Underground Mine base camp and speak with Khedive. Choose the option About the strange object…

Related: Where to find Floating Hydro Fungus in Genshin Impact

Follow the quest marker to the waterfall north of the Underground Waterway with a battle-ready team. Interact with the glowing Investigation spot. After, you need to active the Strange Object using Hydro. Hit the glowing spot with a Hydro Attack, which will prompt a Hydro Geovishap to appear. Defeat it, then head back to Khedive to report your progress.

This World Quest is part of a three-part series that includes the Paleontological Investigation in The Chasm and the Mycological Investigation in The Chasm. Completing all three will reward you with an Academia Recommendation Letter and the Wonders of the World Achievement called Of the Human Heart Many Essays Written.

Check out our guide on How to trigger and complete the Lost in a Foreign Land World Quest chain in Genshin Impact to find another hidden World Quest in The Chasm.