Rubber shows up in several early crafting recipes in Subnautica 2, and the moment you try to make it, you hit a wall: the recipe calls for something called Lucifer Rotsac. The name tells you almost nothing, and the alien ocean floor is not exactly labeled. Here is everything you need to know to track down this plant and start producing Rubber without wasting time swimming in circles.
What is Lucifer Rotsac?
Lucifer Rotsac is a plant found in Subnautica 2. The easiest way to identify it is the glowing orange center, which makes it stand out even in darker sections of the seabed. Once you know what that orange glow looks like, you will start spotting these plants everywhere.
Lucifer Rotsac spawns across a variety of locations. The seabed is the most consistent place to find it, but the plant also appears on decrepit outposts and abandoned buildings scattered through the ocean. That second spawn point is worth remembering for situations where you need a quick top-up without diving deep.
Subnautica 2 Guide: How to Craft Rubber
No tool is required to harvest Lucifer Rotsac. Swim up to it and collect it directly. Each plant yields 1 resource, so grab every one you pass.
Where to find Lucifer Rotsac in Subnautica 2
Lucifer Rotsac is more common than it first appears. The glowing orange center is the key visual cue, and once your eyes are trained to look for it, the seabed starts looking a lot more generous. Here are the key spawn locations:
- The seabed across multiple areas of the map
- Decrepit outposts and abandoned buildings on the ocean floor
Because each plant only gives 1 Lucifer Rotsac, and the Rubber recipe needs 2, plan to grab at least 2 plants per crafting run. If you are building Fins and an Air Tank at the same time, collect more than you think you need.
Lucifer Rotsac appears on both the open seabed and on man-made structures, so even if you are exploring a wreck or outpost, keep an eye out for that orange glow.
For a broader look at navigating the world and managing your resources early on, the Subnautica 2 beginner's guide covering oxygen, scanning, and base building is worth reading before you go too deep.
How to craft Rubber in Subnautica 2
The recipe is straightforward once you have the plant. Open your fabricator and combine the following:
Two Lucifer Rotsac produces one Rubber.
What is Rubber used for in Subnautica 2?
Rubber is a common component for equipment focused on mobility and survival. As a material for Fins and Air Tanks, both of which directly improve how far and how fast you can explore. Getting a steady supply of Rubber set up early means your movement upgrades are never gated by a material shortage.
Do not skip stocking up on Lucifer Rotsac when you see it. Running out of Rubber mid-progression when you need Fins or an Air Tank upgrade will send you back to the surface to farm plants you already passed.
Fins and Air Tank require Rubber
Rubber sits in the same category as other early-game processed materials. If you are also working on Batteries or Ingots at this stage, the same general loop applies: find the raw plant or mineral, process it at the fabricator, and keep a buffer stock so crafting never stalls.
Subnautica 2 is one of the more demanding survival games when it comes to resource management in the early hours, so building good habits around material collection pays off quickly. For a full picture of what is coming to the game as Early Access expands, the confirmed Early Access content breakdown covers every new feature Unknown Worlds has announced, including the 4-player co-op and the new planet Zazura. More Subnautica 2 guides covering resources, crafting, and exploration are collected at the Subnautica 2 guides hub.