To find out exactly what is most commonly missed, we analyzed progression data from over 2,000 dedicated completionists tracking their completion on our interactive Subnautica 2 Checklist and Progress Tracker.
Across our master database of 304 hand-verified items, split across 12 categories like Fauna, Materials, and Biomes, these are the five rarest survival-mode scans and crafts players are missing:
| Rank | Item / Scan Name | Global Discovery Rate |
|---|---|---|
| #5 | Shiver Male | 18.8% |
| #4 | Black Hoverthorn | 17.6% |
| #3 | Cooked Black Hoverthorn | 15.4% |
| #2 | Tallshroom | 4.5% |
| #1 | Deepwing Brooder | 4.5% |
#5: Shiver Male (18.8%)
Scanning the Shiver Male requires a mix of perfect timing and absolute madness on Survival mode.
This creature travels permanently attached to the dangerous female Shiver Leviathan, detaching only when she begins hunting the player. Worse yet, the Shiver Leviathan only spawns past the world border.
To get this scan naturally, you have to intentionally ignore a developer warning message, venture into a terrifying abyss, and pull off a scan while being hunted by one of the most dangerous creatures in the game.
#4: Black Hoverthorn (17.6%)
This midnight-colored fish only spawns in small numbers within the late-game Metal Farms biome.
It is a high-stress environment patrolled by a floating Collector Leviathan and swarming with aggressive Epicurean fish.
Because the Black Hoverthorn looks almost identical to common variants from the starting biomes, players under stress usually swim right past them, assuming they already have the scan completed.
#3: Cooked Black Hoverthorn (15.4%)
Naturally, if players aren't catching the Black Hoverthorn, they aren't cooking it either. With no other major crafting utility, this recipe remains largely undiscovered simply because players don't realize the raw ingredient even exists.
#2: Tallshroom (4.5%)
Despite a microscopic 4.5% discovery rate, this glowing, brown-capped mushroom isn't actually trying to hide.
It is entirely peaceful and sits in plain sight throughout the Hot Cave biome, 200 to 350 meters deep. Because it is mostly decorative and serves no major survival purpose, it has been completely overlooked by major online wikis, leading players to walk right past it.
It possibly looks like many other flora types that simply aren't scannable yet.
#1: Deepwing Brooder (4.5%)
How does a massive, leviathan-class creature tie for the rarest scan in the entire game? Likely just bad luck.
There is only one single pack of Deepwing Brooders on the entire map. They travel along a tight, figure-eight path localized around The Cliff biome near the world border. Unless you are intentionally hunting for their specific migration route, you will likely never cross paths.
Think you've found them all? Track your live completion progress across all 12 categories on our comprehensive Subnautica 2 Checklist or the dedicated Subnautica 2 Progress Tracker.
Methodology
Data is pulled from our 100% Completion database. To keep the metrics fair, we only analyzed data from players who have successfully reached the final currently available biome, Metal Farms.
We cleaned the data to exclude items unobtainable in survival mode, such as Creative-only items (Zezura Poster), unreleased items (Quadrate), or unscannable assets (Locust).
Media Policy
Any publisher, gaming journalist or content creator can freely use the data mentioned in this Game Checklists Insight. You are also free to use any screenshots from this page.
We only ask for a standard editorial attribution link back to the source.
For web articles: please include a clickable hyperlink to either this original data page, our Subnautica 2 100% Checklist, or our Subnautica 2 Progress Tracker.
For video or social content: please mention Game-Checklists.com or drop our URL in your description block.
