First up you'll need to grab the sonar collections dock property in paleto bay as michael, which puts a marker on your map where abigail's waiting at the jetty. She's got this whole thing about finding submarine parts to clear her husband's name, and she'll set you up with a free dinghy that comes with scuba gear, which is pretty handy.

The ocean's split into five areas where you'll find these parts clustered together, and finding all 30 pieces isn't as tough as it sounds once you get the hang of it. When you're getting close to a part, you'll hear these sonar pings getting louder, and that's your main guide underwater. Good to know: while you might see the trackify app on your phone, it's actually not meant for this mission so don't waste time with it. Just focus on those sonar pings, and work through each zone systematically. The parts tend to be near wreckage or notable underwater landmarks, and the noise gets pretty obvious when you're right on top of one. Once you've collected everything, abigail's got another mission waiting called "what lies beneath" so at least there's more content to look forward to.