Here is a quick guide for finding the Primary Containment Facility.
Guide To Finding The PCF
Introduction
In this guide - as you might have guessed - I will be telling you of a quick, relatively safe (who am I kidding) path to the PCF. I will do my best to mark major spoilers, but if you're reading this you should know most of the story by now.
Requirements
For this to work there are a few things that need to have happened, both story wise & through construction.
The first (and only) story related progress you require is a radio message from CTO Yu Lifepod 2 - Northern Blood Kelp Zone.You will need a Cyclops sub with it's Mk. 3 depth module for this - a seamoth can only go about half as deep as we need to, & a prawn Suit will run out of juice before you get there.You will also need a Reinforced Dive Suit - where we're going it gets hot!You will also need a blue tablet - I'll tell you where to get that later.
The Process
Now. For the long awaited trip to the Primary Containment facility!
Step 1Get in your Cyclops. Make sure you have received Yu's message. Go there (ensure you have enough rations) & look around for a large opening in the cliff face. There may or may not be a crabsquid guarding the entrance - just turn your lights off.
Step 2The interior of the cave should look something like this:
Once you have entered the cave keep left! This is very very very important as there is a juvenile ghost leviathan to the right. I found that out the hard way...
After this you should find a large hole that drops straight down - start the decent.
Step 3Stay right now. This is also very important as you don't want to wander into another leviathan's territory. After a relatively short distance you should find another opening. Turn right into it. The cave should look something like this:
Step 4Follow the blue brine. This stuff won't hurt you like the green version does.
Step 5The water should be starting to bubble, & the temperature will be climbing - fast. Keep an eye out for Lava Larva - they'll drain your power cells & leave you stranded. Don't worry, your vehicle is immune to heat damage (not lava though - that's too hot). Carry on through this lava corridor & you should reach a vast cave with small lava rivers & very loud roaring. Have a quick look around for large hostiles - switch to silent running if necessary to avoid destruction.
Step 6You will need a Blue Tablet to access the facility - get the blueprint from inside the Lava Castle (that big rock dome. Take your power cells with you - you don't want the energy sucked out of them by the Larva There should be a doorway looking thing leading through some caves - watch out for Lava Lizards.
Step 7Once you have returned from your task of the blue tablet, follow the streams of lava - you should find a large depression that your sub will fit down. Go down this hole, but beware - a Sea Dragon Leviathan guards your target.
Step 8Switch to silent running if you haven't already - you won't make it there alive if you don't. Now - go around the leviathan by clinging to the cave walls.
You should be at the PCF by now - make use of your blue tablet & open the facility!
Congratulations!
Congrats. You have reached your target. Now go finish that storyline!
Source: https://gameplay.tips/guides/7564-subnautica.html
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