You need Dredge refined metal in order to upgrade your hull to tier 2, so you might wonder where to get this particular resource. It's a curved metal sheet that the Shipwright can use to upgrade various aspects of your fishing vessel, so you can take a few more hits or crash into a few more cliffs before your ship is completely destroyed...
Read more.
Where to get refined metal in Dredge
Source: PC Gamer (opens in a new tab)