The Drowned Hopes side quest in Horizon Forbidden West can be started by talking to Corend at Camp Nowhere, northeast of the Las Vegas ruins, but you can skip the first part of the quest by starting instead at the Carja Camp southeast of Plainsong. Talk to the two Carja Scholars there and they will tell you that they want to return to their dig site. You — being the hero and everything — volunteer to help.
Related: How to complete the Shining Wastes Tallneck in Horizon Forbidden West
Follow the marker to the dig site, Jagged Deep Delve, on the far side of the lake, and kill all the machines you find there. The Scrappers are easily disposed of, but the Widemaws are much tougher and more dangerous. Place Purgewater traps in their path, and use any other Purgewater weapons or tools you might have — they’re strong against all other elemental attacks. Otherwise, target their bellies, butts or, if you get the chance, the inside of their mouths.
For the next objective you’re going to need to do some underwater breathing, which means that, if you haven’t done it already, you’re going to have to start the Seas of Sand main quest in order to craft the diving mask Special Gear. Swim out into the marked area until you discover a Sunken Wreck, then dive down to investigate it. Use your Focus to highlight a Security Console inside the wreck, then swim down to the bottom of the northwest side of the wreck, and swim through the gap in the rocks.
Examine the Security Console, then search the Ancient Trunk to find the first of three Vault Keys. Follow the marker to discover Dread Bluff, the site of a second Security Console. Climb inside the ruin, drop into the water, then climb back up to the pink-lit hatchway. The second console is in
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