The Treasure Hunters
In this Zelda: Tears of the Kingdom side quest guide, we'll give you the complete tutorial for side quest: The Treasure Hunters.
This mission is triggered when you talk to Domidak and his companion, who are near a lake filled with sludge. You can find them south of Rauru Hill, south of Korok Forest and west of Forest Relay.
Domidak will inform you that he's trying to reach a chest in the middle of the sludge lake, but just can't get there. The rest is up to you! Simply fetch materials (which are close behind you), using Ultrahand, glue wooden platforms together to create a bridge and head for the chest.
We then used Ultrahand to glue the chest to the wooden platform and take it back to Domidak and her companion. To complete the mission, simply chat with Domidak, who will tell you to keep the contents of the chest since you obtained it first. When you open the chest, you'll receive 3 Flower Bombs. This concludes the side quest: The Treasure Hunters.