After meeting Marguerit Maida in her underwater base, you’ll be able to scan a PDA that gives you the blueprint for the Test Override Module. We can craft that to progress the story, but, first, we’ll need to acquire the Parallel Processing Units. Here’s our guide to help you find the Parallel Processing Unit locations in Subnautica: Below Zero.
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Subnautica: Below Zero guide – Parallel Processing Unit locations
The Parallel Processing Unit can be crafted once you’ve found three of its fragments. Unfortunately, these are also scattered across various parts of the Mercury II, a giant ship that crashed and is now beneath the waves.
The Mercury II broke up into several parts that can be found in the Purple Vents and Lilypad Islands biomes east of Delta Island.
You’ll want to explore all the wreckage scattered about since each segment of the ship should have at least one Parallel Processing Unit fragment that can be scanned.
Just make sure to bring a Laser Cutter with you (2x diamonds, 1x titanium, 1x crystalline sulfur, and 1x battery). You’ll need the gadget to cut open the panels that have the Parallel Processing Units.
After scanning three fragments, you should be able to craft a Parallel Processing Unit via the Fabricator. The component requires 1x gold, 1x silver, and 1x table coral sample.
But, that’s not all, you still need to craft the Test Override Module. It requires 1x Parallel Processing Unit, 1x copper wire, 1x titanium, and 1x lead.
Once you have the Test Override Module, return to Delta Station and make your way to the radar tower at the summit. Climb the ladder and place the module inside the panel. Then, head back down and deactivate the radar.
Marguerit Maida will be happy with your efforts since Alterra won’t be able to track her anymore. She’ll tell you to find her Greenhouse so you can continue Subnautica: Below Zero‘s campaign.
Be sure to check out Yahtzee’s thoughts on Subnautica: Below Zero in the Zero Punctuation review below: