Alterra Corporation

Alterra Corporation is an interstellar mega-corporation in the Subnautica universe. Though it identifies as a corporation, it is legally classified as a Trans-Gov — a government-scale entity recognized under interstellar law. Alterra owns 9% of all phasegates in the galaxy, is a major supplier of starship technology and consumer electronics, and serves as an official supplier to the Trans System Federation.

Alterra is composed of millions of partially or fully owned smaller companies, governed by an elected board of directors. It is one of the largest Trans-Govs in the known universe.

In Subnautica

Alterra owns the Aurora, the Long-Range Capital Ship that crashes on Planet 4546B at the start of the first game. Ryley Robinson is an Alterra employee serving as Non-Essential Systems Maintenance Chief. The Aurora's mission is phasegate construction in the Ariadne Arm, with a secondary search for the wreck of the Degasi.

The PDA and debt system

Every Alterra employee carries a company-issued PDA that tracks resources, logs data, and enforces corporate policy. All resources harvested while an employee is "on the clock" — including during survival situations — are legally Alterra property. The PDA notifies the player in real time as their resource debt accumulates. Picking up a Diamond for the first time triggers a three-million-credit notification.

By the time Ryley escapes the planet, his total accumulated debt reaches approximately one trillion credits. In the post-credits scene, Alterra informs him that he will not be permitted to land until the debt is settled. His fate after this message remains unresolved.

In Below Zero

Two years after the first game, Alterra returned to 4546B and established research operations in Sector Zero, monitored from the Vesper orbital station in geosynchronous orbit. Robin Ayou works under cover as an Alterra researcher. The company discovered a frozen leviathan still infected with Kharaa and began studying the bacterium.

Sam Ayou (Robin's sister, also an Alterra employee) uncovered evidence that the company's interest in Kharaa went beyond legitimate research into bioweapons. When Sam sabotaged the research and died in the process, Alterra covered up the true circumstances, ruling her death as negligence. This cover-up is what drives Robin to travel to 4546B.

Corporate culture

Alterra's corporate behavior is consistently ruthless across both games. It sends employees to frontier worlds with full knowledge of the dangers, bills them for their own survival, covers up employee deaths to protect its reputation, and researches alien pathogens for potential weaponization. The PDA's entry on the Warper (an alien defense robot) reads: "Assessment: Immobilize and return to Alterra for mutual profit" — suggesting the company would attempt to monetize even existential alien threats.

In Subnautica 2

Alterra's role in Subnautica 2 has not been fully detailed in pre-release material. The Voices from Beyond audio drama includes a character credited as "Mom / Alterra Engineer," confirming Alterra remains an active presence in the timeline. The protagonist of Subnautica 2 wakes after a 14-year cryosleep en route to Planet Zezura, guided by a ship AI on a "now-compromised mission" — though whether this mission is under Alterra's banner or another entity's remains unclear.