Lost in Deep Seas is the fourth and final part of the Archon Quest Chapter 4, Act 3 in Genshin Impact. See how to unlock this quest, its walkthrough, and all the rewards of this quest here in this guide!

How to Unlock Lost in Deep Seas

Complete the The Proscribed, Hidden in Plain Sight Quest

To unlock Lost in Deep Seas, you must have completed the previous subquest of To The Stars Shining in the Depths, The Proscribed, Hidden in Plain Sight!

The Proscribed, Hidden in Plain Sight Guide

Lost in Deep Seas Walkthrough

Investigate freely

After waking up, glide down to the Administration Area and find Vidoc.

Speak to him about one final "hidden rule": never go near the pipes that makes strange sounds in the middle of the night. He'll also point out the three people that you might want to speak to after he leaves.

Ask the trio that hangs out together often

The trio that Vidoc previously mentioned—Leonide, Poirier, and Alexis—will be back from the Production Zone. Talk to each of them and see what intel you can gather.

Ask Fielding at the dormitories

After speaking to the trio, you and Paimon decide to ask Fielding for more information. Go up to the Dormitory Block and make your way to Fielding.

Return to the dormitories and rest until night

With usable information finally gained, return to your dormitory to rest and wait for nightfall.

Go to where the rumored pipes are

Come midnight, you and Paimon will wake up and will be tasked to go to the rumored pipes. However, the Dormitory Block will be swarming with guards, and you have to get past them without being seen.

Take a left to the inner circle of the block then proceed straight through. One of the guards will turn around to give you access. For full and detailed instructions on how to get past the guards without being detected, check out our full guide below!

How to Get to the Rumored Pipes

Enter the pipe

Once you're past the guards, enter the pipe and speak to the trio you previously spoke to from when you started the quest to learn more about Childe's whereabouts.

With significant progress in your investigation, your final task is to return to the dormitories and rest up to end the quest and Act 3! To progress with the Archon Quest, you can move onto our guide for Chapter 4, Act 4!

Archon Quest Chapter 4 Act 4 Guide

Lost in Deep Seas Rewards

Total Quest Rewards

Total Quest Rewards
Primogem x30	Mystic Enhancement Ore x11	Mora x76475
Hero's Wit x6

Genshin Impact Related Guides

All Quests and Quest Types

Other To The Stars Shining in the Depths Quest Guides

To The Stars Shining in the Depths Quest Line Guide

All Fontaine World Quests Guide

List of World Quests