Most people who playedSubnauticafor the first time had no idea what to expect. The cover art looked friendly enough, but an immediate crash landing opens the game. Afterward, throughout the gameplay, the constant sense of foreboding that weaves into the player’s mind ensures that they never feel too safe.
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These feelings are soon justified. When players delve further or deeper into the alien ocean, they are greeted withincreasingly terrifying and dangerous creatures. The two Blood Kelp biomes are among the game’s most dangerous areas, so it’s worth knowing what to expect before heading into these zones.
Updated Jun 17, 2025 by Jack Pursey:Before leaving the safety of a base of the Lifepod to venture into one of Subnautica’s many dangerous biomes, it is essential that players prepare for the journey every time. Subnautica gives players a huge range of helpful items to craft, such as oxygen tanks, health kits, and tools - though it’s the game’s vehicles that are by far the most useful craftables for traversing biomes as safely as possible. Consequently, we’ve updated this list to explain how to craft the game’s best vehicles.
Blood Kelp Trench
The Blood Kelp Trench is significantly smaller than its Northern Blood Kelp Zone counterpart. It is also safer, thanks to not containing a Ghost Leviathan or Crabsquid.The area is located at coordinates -988 -379 -546, south-west of the starting place of Lifepod 5, north-east of Sea Treader’s Path, north-west of Sparse Reef, and south-east of the Dunes. Finding small areas inSubnauticacan be tricky due to the lack of map function, so be sure to leave a beacon upon reaching the area.
Despite its small size, there are a handful of reasons to visit the biome. Along with the resources, fragments, and data boxes listed below,the entrance to the Lost River can also be found here, at the coordinates -1220 -610 -325.
Aggressive Fauna
Northern Blood Kelp Zone
The Northern Blood Kelp Zone is far larger than the Blood Kelp Trench andcan be found at coordinates -988 -379 -546.It is north-west of Lifepod 5, north-east of the Dunes, and north-west of the Underwater Islands. Again, be sure to leave a beacon in the area upon arrival if planning to return. Like the Blood Kelp Trench,the Northern Blood Kelp Zone has an entrance to the Lost River, this time at the coordinates -705 -565 -1090.
Which Vehicles To Use And How To Craft Them
Thankfully, players don’t have to traverse the dangerous biomes with just their flippers, as there are a handful of vehicles to craft that can offer an increase in speed, more protection fromdangerous predators, and ensure that players don’t have to worry about oxygen levels.
The Seamoth, Prawn Suit, and Cyclops are the three vehicles that players can craft inSubnautica. Truth be told, which vehicle is best for traversing the Blood Kelp biomes is largely down to personal preference. So, to help players decide which vehicle to take,here’s a description of each one and how to craft them:
Seamoth
For the vast majority of players, the Seamoth is the first vehicle that they will craft. The Seamoth lacks the inherent protection that the Prawn Suit and especially the Cyclops provide, butit’s small, agile, and fast, making it ideal for maneuvering in tight spaces and speeding away from danger. The Seamoth can be fitted with several upgrades, including Hull Reinforcement, Sonar System, and Perimeter Defense System.
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To craft the Semoth, players need to combine the following items at a Mobile Vehicle Bay:
Prawn Suit
The Prawn Suit is a wonderfully futuristic-looking vehicle thatlets players stomp about on the ocean floor- a form of travel in the game that many players say feels to benot as scaryas swimming or driving through the water. ThePrawn Suit’s main strength compared to the Seamoth is that it has 600 health, which is double the Seamoth’s 300.
Like the Seamoth, the Prawn Suit has a wide range of upgrades that can be crafted, including the Jump Jet Upgrade, Grappling Arm, and Torpedo Arm.
To craft the Prawn Suit, players need to combine the following items at a Mobile Vehicle Bay:
Cyclops
The Cyclops is the most advanced vehicle in the game by far.The Cyclops is an enormous submarine with a whopping health of 1500 and is essentially a drivable baseas players can craft fabricators, lockers, and more inside.
Unsurprisingly, the Cyclops' main weakness is its maneuverability. The vehicle’s size makes tight spaces impossible to traverse while turning the vehicle is also tricky. Upgrades for the Cyclops include the Creature Decoy Tube Module, Shield Generator Module, and Thermal Reactor Module.
To craft the Cyclops, players need to combine the following items at a Mobile Vehicle Bay:
Subnauticais out now for PC, Nintendo Switch, PlayStation 4, PlayStation 5, Xbox One, and Xbox Series X/S.
