Giveaway Items

Giveaway Items are placeable items built using the Habitat Builder. They can only be placed inside of the Cyclops or Seabases.

Access to these items is restricted. One either had purchased the Subnautica Special Edition or redeemed a special activation code in an in-game menu. Redeeming a code successfully added the item in question to the player's Steam inventory and unlocked it inside the game.

Most of them are dedicated to certain Youtubers. All Giveaway Items except the Special Edition Hull Plate and the models are tradable inside the Steam economy.

For common players, these other variants are not available; the redeem code was given to the rightful owner and only that person can build it in-game. In post-1.0 updates, the option to redeem item codes was removed from the menu; making giveaway items unobtainable through redeemable codes.

Hull Plates=

Special Hull Plate Upgrade

 * The Special Hull Plate Upgrade is a variant of the Hull Plate that was available to those who bought the Subnautica Special Edition only via HumbleBundle, which is no longer available.
 * Each of these plates features a unique, manually inserted number and the purchase date. As creating these plates manually proved to be quite time-consuming and complex, the Special Hull Plate Upgrade was discontinued.
 * Caption: Limited edition numbered hull plate (thank you!)

Dev Test Item

 * Nickname: Flayra
 * Name: Charlie Cleveland
 * Known from: Unknown Worlds: Subnautica
 * Caption: A totally useless item you shouldn't even want. Could be better.
 * Info: The Dev Test Item Hull Plate is dedicated to Subnautica Game Director Charlie Cleveland.

Bikeman Hull Plate

 * Nickname: Bikeman (BikestMan)
 * Name: Unknown
 * Known from: YouTube and Steam
 * Caption: The bikest of men, Bikeman rolls his trike squad through games big and small. If you find him in Cherno, he is probably not friendly.

Diorama Hull Plate
Check out his models here
 * Nickname: Dchicote
 * Name: Andreas
 * Known from: Steam
 * Info: The Diorama Hull Plate is dedicated to Dchicote who made a miniature version of a Seabase inside a glass exhibition for Subnautica.
 * Caption: A special Hull Plate to commemorate a unique diorama.

Eat My Diction Hull Plate
(Purchased From Community Market)
 * Nickname: EatMyDiction1
 * Name: Nick Mead
 * Known from: YouTube
 * Caption: Running the most sober streams on all of Twitch TV, Diction has been dictating the good word of gaming since 2011.

Gilathiss Hull Plate

 * Nickname: Gilathiss
 * Name: Krystian Bończyk
 * Known from: YouTube
 * Caption: Polish YouTuber. Has biggest "Subnautica" series in Poland. Generally recording survival and sandbox games. He's also making videos from Indie and Early Access games.

Indie Game Promoter Hull Plate

 * Nickname: IGP
 * Name: Adrian
 * Known from: YouTube
 * Caption: Indie Game Promoter, as name suggests, promotes indie games big and small!

JackSepticEye Hull Plate

 * Nickname: JackSepticEye
 * Name: Sean William McLoughlin
 * Known from: YouTube
 * Caption: Jack creates clean, appropriate for viewing by fourteen and up ages.

LordMinion Hull Plate

 * Nickname: LordMinion777
 * Name: Wade Barnes
 * Known from: YouTube
 * Caption: The most handsome Subnautica Hull Plate of all time.

Markiplier Hull Plate

 * Nickname: Markiplier
 * Name: Mark Fischbach
 * Known from: YouTube
 * Caption: I'm not scared. Not even a little bit.

Muyskerm Hull Plate

 * Nickname: Muyskerm
 * Name: Bob Muyskens
 * Known from: YouTube
 * Caption: Reconsider your YouTube subscription standards.

Gallery
Models=

Jack's Septic Tank
Another tribute to popular YouTuber JackSepticEye, a model of his channel mascot Septiceye Sam in a jar. When clicked on, Jack's Septic Tank will jiggle around and say high-pitched voice lines from JackSepticEye.

Code: SMHB-VC57-V748-8EGU-1EO (only redeemable 1,000 times, no longer functions)

An Unusual Doll 2
This model is a doll of a character of Markiplier's, Wilford Warfstache. It is identical to the other unusual doll aside from a slightly different pose and a large, pink moustache. When clicked on, the doll will say voice lines from Markiplier.

Marla
A second tribute to a popular YouTuber by the name of "EatMyDiction". This is a model of his pet cat Marla.

Trivia

 * The flavour text for the Bikeman Hull Plate is a reference to DayZ, a zombie survival mod for the game ARMA 2. "Cherno" is a nickname for Chernogorsk, the largest city in the mod.
 * The flavour text for the EatMyDiction Hull Plate refers to Diction's frequent and popular "drunk streams", in which he and his friends get extremely intoxicated while playing and livestreaming videogames.
 * Due to a bug in current stable builds of Subnautica, obtained giveaway items are currently unbuildable in-game. In experimental builds the items are still buildable..