Before searching for the Marine Armor in Fallout 4: Far Harbor, you need to have reached the point in the quest Best Left Forgotten where our guide ends. Alternatively, take a look a the screenshots below and place some custom markers. Other than that, the only requirement is that you don't mind getting wet. The clue's in the name, really.
Once you've finished delving into DiMA's memories, you may have noticed there was a mention of the Marine Armor - a powerful new protective set of post-apocalyptic clobber that's exclusive to this expansion. Head to your miscellaneous quest tab and you'll see one called 'Find the Marine Combat Armor Shipments'. Select it and you will see a bunch of new quest markers on your map. Let's walk through them one at a time, starting from the one in the Southwest corner of the map.
When you eventually reach the coast, it's time to swim - or stomp, if you're wearing power armour - to those sails you can see protruding out of the depths. It's probably obvious, but the Aquagirl/Aquaboy perk, which allows you to breathe underwater, is really helpful for this. Before you reach the sails you should come to a metal husk sticking above the water's surface - this is your destination. Swim down into it and you'll find the right and left leg pieces for the armour.
Now let's head for the Northwest marker. Once you reach the shore, it's time for another swim. Switch on your Pip-boy light and swim across the ocean bed towards the marker. Eventually you'll come to a shipping container. Here you will find the Assault Marine Armor Helmet, the Marine Tactical Helmet, the Assault Marine Armor Chest Piece and the Marine Wetsuit.
Time for the last marker. Depending on how you approach, you could find yourself facing off against a group of Super Mutants at the Harbor Grand Hotel. Be wary of melee mutants charging you, along with their hounds. It's easy to get backed into some rubble.
Once you're done, it's time to get your feet wet again. Might as well stick on that wetsuit you found, eh? It's quite a swim to this one, but you'll see a wreckage protruding out of the water as you get close. Dive down to the depths to the marker and grab the left and right arm armour pieces to complete the set. Swim back to shore and don your new gear.
For a full walkthrough of the DLC's main storyline, head to our Fallout 4: Far Harbor guide.
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