Destiny 2's Ghosts of the Deep is a Dungeon that offers a lot of loot through its encounters. I've compiled a list of what you can get below.
Destiny 2: Ghosts of the Deep Dungeon GOD ROLL GUIDE! (PVE Rankings)
There are three different encounters in Ghosts of the Deep. Each of these encounters gives you the chance to unlock a number of weapons, armor, and eventually an exotic.
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The Navigator is an exotic Strand Trace Rifle that can be obtained during the third encounter with the Ghosts of the Deep Dungeon.