How to get to Combine Dredge
In order to reach The Combine Dredge you'll first need to complete enough TDS progression to be given access to this zone. Once you're able to enter the zone, to get there you'll want to first travel to Brother Island and then to the eastern side of the small island where you'll find a dock and a single boat (pictured below).
All you need to do to zone into Combine Dredge is click on the boat at this dock. You can also walk ontop of it too - that'll zone you into Combine Dredge as well.