About Helvegen
From Steam WorkshopOriginally designed for mining and recovery missions, it was repurposed to house the FFAB12 Fission Regulator Prototype, the forerunner of the fission controllers we know today. - This submarine is…
Originally designed for mining and recovery missions, it was repurposed to house the FFAB12 Fission Regulator Prototype, the forerunner of the fission controllers we know today.
- This submarine is 100% vanilla, it doesn't require any mod.
- This submarine is very optimized for performance. My potato PC can handle me and my friends playing on it.
- This submarine has been thought for a group of players from 4 to 11+ players, and to make beginners able to learn the ropes of the game from it, while still giving veterans a challenge.

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Statistics
- Crew : 4-11
- Price : 8500 mk
- Max horizontal speed : 26 km/h
- Max vertical speed : 19 km/h
- Size : 44 m x 13 m
- Cargo capacity : 26 crates
- Starting items : Low
- Drone : None[/list]
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- [h1]Main features[/h1]
- [list][*] A reactor with needs : Bored of the Auto-Reactors, but still not wanting to use the crappy one included in your reactor ? Try out the "new" FFAB12 Fission Regulator Prototype ![/list]

- [list][*] You will need to use the terminal to take care of it, or trouble may arise ![/list]

- [list][*] Deployable external cargo hold : No need to go through the airlock a hundred times while looting a wreck ![/list]

- [list][*] Modular ballast anti-flora system : Press the lever, and the ballast will deactivate itself after drying itself, allowing easy removal of ballast flora. But this simple system is wirable, and there might be some detonator to wire to the system to make it even easier...[/list]

- [list][*] Secured depth charge launchers : No more nuclear incidents ! If the light is red, the Depth Charge can't be fired ! The Captain is able to know how many depth charges are active thanks to some lights on his navigation terminal.[/list]

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- [h1]Other features[/h1]
- This submarine also features a lot of standard things to find on a submarine :
- [list][*] Auto-batteries : The batteries will automatically take over when the reactor doesn't output anything. This system can be turned off.
- Fabricators : This submarine features everything you need fabrication-wise : a fabricator, a deconstructor, a medical fabricator, and a research stations
- Non-perfect weapon coverage : Some dangerous blindspots, especially the airlock. Additionnally, the railgun is not swappable, and the periscopes are in two separated gunnery compartments.
- Manual alarm system : The Captain is able to turn all the ship's lights red, to make the crew move their asses faster.
- Passenger transport room : Enjoy it as a crew, or lock it when transporting passengers ![/list]
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- [h1]Additional notes[/h1]
- Rewirability : With the sole exception of the reactor set_turbineoutput and set_fissionrate entry pins, every visible item can be rewired. The rest of the reactor pins can be acceded through the relays in front of it. The submarine wiring can also be improved in several ways, if an engineer take some time to look at it.
- Compatibility with bots : The bots are able to repair everything, but are also able to store every game item in its corresponding locker.
- Room security : Although there are secured lockers, the room themselves are not id secured, but can be locked from the inside.
- Reboot system : Although the reactor terminal has integrated anti-bugs, if it still crash, please report it to me, and try the Reboot to un-bug it.[/list]
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- [h1]Special thanks :[/h1]
- [list]
- The Undertow discord community :
- https://discordapp.com/invite/xjeSzWU
Don't hesitate to leave comments or ask questions ![/code]Highlights
From source dataFootprint
Rated a light load on a server.
Last update
Its author last shipped an update 17 mo ago.
Helvegen on Nxeon
From our catalogue- One-click install
- Not available. One-click install isn't available for this game's mods yet. Download it and upload it to your server in Files.
- Server load
- light
- Smallest plan we suggest
- Barotrauma — 2 GB (2 GB RAM). This follows our own load rating above, not a benchmark.
- Latest build
- 2025-06-01, released 2025-06-01
Game versions by loader
| Loader | Game versions | Newest |
|---|---|---|
| Workshop |
From 1 recorded build of Helvegen.
Run Helvegen on a Barotrauma server
Deploy a server above, then upload the file in Files.
What kind of mod it is
From the catalogVehicles & ships
Cars, boats, aircraft, ships and other things to drive or fly.
Compatibility
- Game
- Barotrauma
Verified at the source
- ✓Steam WorkshopOfficial listing, checked 2026-10-10Open ↗
- ✓AuthorRenko, as published on Steam Workshop
- ✓LicenseNot published by the sourceFree
