i have a mod for more time capsules and one to make me able to scan for them and i personally go around placing scanners every while and just scan for time capsules and hope for cuddle fish eggs as of now i got 15 and im planning on getting 100 before building a 10 story multipurpose room with alien containment to have over 100 cuddle fish in them then a while later i would just unleash the army to the wild and watch the chaos and keep some for the bioreacto-

my lawyers have advised me to not finish this joke.

You get eggs, and place them in there. You can also pick up small fish like bladder fish and put them inside.

To contain aliens

tell me what? are the 10 story tall alien containment not big enough? tell me what?

Just get a water filtration machine. It gives you large bottles of water (+50 water instead of +20) and also salt which you can use to cure fish for food.

If you don't have the blueprint it's in >!one of the degasi bases!<.

I have reginalds and blood vines in mine, but honestly, the real reason I use it is to get around the base faster.

u dont understand the amount of ion cubes stasis rifles and thermoblades that i found... its gotten to the point of me needing to install the everything 1x1 mod and filling an entire large room walls with normal lockers just so i can store them (and after counting a while ago so who knows how much i have now i have about ~93 ion cubes and ~30 stasis rifles and ~52 thermoblades)

Best early game water source is salt + coral to make bleach then you can make 2 x disinfected water, suprised you hadn't discovered that by the time you were able to build an alien containment lol

You can use it to reproduce fish, put a couple of the same fish in & they'll breed. You can get eggs to hatch creatures, it's a good way to get Stalker teeth for enamled glass

It looks pretty cool as well. You could make severals floors of alien containments.

If you breed crabsquids, you can drop them and they'll attack warpers. Handy if you need to explore a wreck or make a quick escape.

As bio-reactor fuel...

The top three fish (in no order) for the alien containment are:

1. Reginald. This fish has the second highest food value in the game. The highest food value is the non-replenishable nutrient block.

2. Bladderfish. A good secondary supply of water alongside filtration systems. Tip: raw Bladderfish can be eaten to restore oxygen.

3. Oculus. This fish has the best energy to size ratio of any bioreactor fuel. They last quite long in the bioreactor. With a double stacked tank of Oculus fishes, you'll probably never run out of biofuel. Oculus also have a high food value, even if it's not as filling as the Reginald.

I dont have belo zero so i have no idea what that is

hell yeah

No idea for subs, but in case you are looking for that WY style and didnt know about the mods, there is a couple xenomorph ones. One that adds the entire lifecycle (entity wise, not sure if they grow up) on top of a handful of the xenomorph types from the less popular movies.

Finding subs with an alien containment might be a pain in the ass though since id assume they would want to just rip through the hull/walls. Maybe modding in some as pets is possible to have non hostile ones? Not sure what is fully capable tbh

Malachite.

The containment cell is attached to the research bay. The cell also contains... disciplinary measures.

Enjoy the Malachite.

you know i played on a submarine that had a holding cell, 2 actually one was very large but i cant remeber the name of the sub, the other is the bicksborg with a cell right under medbay with coil a pum and a toggleble air supply, so you can shock drown and suffocates your "patients"!

Not sure if this fits, community curated subs pack continued has Tanit-B, which has an airlock in room to the right of nav room. You can close bottom and right hatches and there's a window to see from nav room. Top hatches can be cycled to let in water and other creatures. Maybe leave an assistant in the room as bait? But I'm not sure if it can contain powerful monsters since they'll just start breaking things. Large creatures also can't fit.

https://preview.redd.it/n41xwq4ddc6f1.jpeg?width=1450&format=pjpg&auto=webp&s=ec9cbf1e798aa05fad6f67b9931bd6a3b787b77b

That's awesome! Nice work

My best day in Subnautica was when I learned you can put containment units in large rooms, not just multi-purpose rooms. Large rooms are great as hubs for bases, but the middle always felt so empty...now I have two tanks, one for cuddlefish to safely chill out in, and another for miscellaneous egg-hatching.

Did you turn the arch on?

If you haven’t found it yet, there is a small portal in the back of the empress’ area and an extra ion cube. The small portal just takes you back upstairs but if you would get trapped down there without an ion cube, this one free one will help you get out. I’ve also heard there is an extra ion cube in one of the trenches on the floor.

And the 4 portals will take you to all the ingredients biomes for the hatching enzyme. It’s better to not go through the big portal which takes you under the QEP because you honestly don’t need to go out there until the eggs hatch.

what exactly are you trying to acheive?

You have to >!activate the arch, then she gives you the blueprint for the hatching enzymes!<, which you'll need to gather to advance the story.

I have 3 13 storey large room tower blocks, with 4 massive tanks in each. Each one has a different biome represented. It's a gigantic pain in the hole if you introduce a fish with Kharaa. Your whole tank gets it. And don't ask how long it took to amass the resources for it. Let's just say I tripled my play time.

Plant a brain coral and extend your swim with the fishes.

In large rooms, you can stagger where you put them too, so that the tanks are more interesting to look at.

Where we're going, we don't need ladders.

I have two containment tanks in Below Zero. One is 4 levels high and the other is 5 levels high.

In one of them, I breed Peepers for food. In the other, I breed Sea Monkeys... for fun.