Once Human Isles of Abyss Update Is Live With a Haunted Sea to Survive

Image: IGDB

Once Human’s ocean scenario is live, but the download is the first boss

Once Human has opened the sea. NetEase and Starry Studio’s official Version 3.1.1 update notes say the new PvE ocean survival scenario, Isles of Abyss, becomes available after the October 21, 2026 PT update, bringing a new ocean map for RaidZone Mode, new combat weapons and armor, a First Person OTS feature, the Halloween Wonder Night event, a limited Lightforge Loot Crate, fashion dye additions, Radiance Benefits changes, and bug fixes alongside the headline scenario.

For returning players, the immediate tension is practical before it is nautical. The official update announcement lists a large client download because of resources tied to Isles of Abyss and the new RaidZone ocean map. NetEase lists approximate launcher sizes of 12.29 GB on PS5, 20.39 GB on Xbox, 26.28 GB on PC, 4.8 GB on Android, and 5.7 GB on iOS, with smaller in-game update sizes on console and PC. The studio also warns that if the Steam platform push is delayed, duplicate downloads may occur. In plain survival terms, make storage space, use Wi-Fi where possible, and do not assume this is a quick login before the tide turns.

The Once Human Isles of Abyss update is available across the game’s supported ecosystem according to the official update notes, which name PC, console, and mobile in the scenario materials. MMORPG.com also reports that the scenario is now available on all platforms. There is one date wrinkle worth noting: the PlayStation Blog post by Once Human lead game designer Vincent Tao says the expansion launches on PS5 “tomorrow” from an October 21 post, while also including “October 22 (October 21)” wording. The official Once Human update page anchors availability to after the October 21 PT maintenance, so players should treat the in-game server opening and platform patch availability as the final check rather than relying on one headline date.

A haunted sea changes the pressure loop for returning players

The strongest reason to come back is that Isles of Abyss moves Once Human’s survival pressure away from a familiar wasteland rhythm and onto a hostile ocean with its own rules. The official dev blog describes the setup as a shipwrecked journey through scattered islands, nautical journals, ship artifacts, and lost deep-sea memories. It introduces Malla, an experienced captain who rescues the player and can use “communion with the deep” to sense the pasts of the drowned and guide voyages. That framing gives the update its horror texture: the water is not empty space between objectives, it is the place where unfinished promises, guilt, waiting, and trapped memories accumulate.

The PlayStation Blog is even more explicit about the mood. Tao says the ocean in Isles of Abyss is a massive conscious entity known as The Sunken Lord. In that post, the water surface is described as its physical body, while eerie lighthouses called The Tower and spectral ghost ships called Voyagers operate as organs and manifestations of its will. The sea watches, reacts, and feeds on fear, according to the developer description. That is the key tonal shift for a survival shooter built around anomalies: the map itself is positioned as predator rather than backdrop.

This matters for returning players because a good survival update lives or dies on pressure, not scenery. Pocket Gamer reports that players move through five new hazard zones, each packed with danger and obstacles that must be answered by unlocking ways to resist them. The PlayStation Blog names some of those regional threats, including mysterious fogs, violent black tides, and skies raining temporal fire. Those details suggest a progression loop built around environmental resistance, visibility, mobility, and preparation, rather than a simple sprint from island to island. That is the haunted sea promise: travel itself becomes a threat assessment.

Shipbuilding is the new base game at sea

Isles of Abyss puts vessels at the center of progression. Pocket Gamer reports that players begin with simple sail-powered rafts and can progress along a nautical tech tree toward massive battleships. The PlayStation Blog frames the ship as a “mobile Sea Fortress,” describing it as transportation, forward base, workshop, heavy artillery platform, and survival tool. Tao says players can build toward different fantasies, including a wooden pirate ship with broadside cannons, an industrial drilling rig, a sci-fi aircraft carrier, or stranger floating designs.

The important design shift is that your base is now exposed to the same danger as your body. Once Human already revolves around crafting, territory, gear, and anomalies, but an ocean scenario makes movement, storage, firepower, and repair feel interlocked. If your ship is the workshop and the artillery platform, then underbuilding it is not a cosmetic mistake. It becomes a tactical weakness. Pocket Gamer’s description of a climb from raft to battleship fits the survival arc: fragility first, confidence later, and hopefully enough armor between you and whatever is moving under the hull.

The PlayStation Blog also says players can team up to form fleets and coordinate ship designs for different hazards. Pocket Gamer similarly emphasizes that the largest threats will require players and friends to work together. The sources do not provide detailed ship stat tables, building limits, server performance targets, or solo scaling numbers, so players should avoid assuming that a solo raft-to-warship path will feel identical to coordinated fleet play. What is confirmed is the intent: your vessel is the central answer to the Once Human haunted sea.

Diving, islands, and the land-sea loop give the scenario its teeth

The official update announcement says Isles of Abyss asks players to explore scattered islands, gather resources, build facilities, dive deep into the ocean for lost treasures, and face unknown challenges in the waters alongside companions. MMORPG.com also identifies diving and shipbuilding as new mechanics tied to the scenario, alongside new biomes, new hazards, and narrative content about awakening and stopping a predatory sentient ocean.

Tao’s PlayStation Blog post describes the progression as a land-sea loop. Resources gathered on mysterious islands fuel naval technology and heavy weaponry needed for open-water encounters. In turn, deep-sea exploration yields specialized materials that improve terrestrial gear and base progression. That loop is the practical spine of the update. If you are returning after time away, do not treat the ship as a side project you build after clearing land content. The developer description indicates the two sides feed each other.

The official materials stop short of detailing every diving risk in the provided source text, but the direction is clear enough to plan around. Lost treasures are underwater, ships need upgrades, and hazards gate progress. For a returning player, that means the best first hours are likely to be slower than a standard combat grind. Learn what resources are island-bound, what requires diving, what your vessel can survive, and which facilities belong on board before chasing every marker into the fog. Isles of Abyss sounds built to punish players who mistake the sea for an open road.

Boss progression escalates from towers to The Sunken Lord

The update’s enemy structure is staged around regional and server-wide escalation. Pocket Gamer reports that Isles of Abyss introduces bosses across three phases, beginning with the Towers of Calamity, described as massive biomechanical lighthouses infesting each region and requiring players to team up to defeat them. The PlayStation Blog’s developer post lines up with that imagery by describing colossal towers as regional boss anchors and part of the ocean entity’s manifestation.

Pocket Gamer says phase two adds new bosses and random Corruption Zones as players across the server make progress. The official dev blog gives the larger schedule: Isles of Abyss is a PvE scenario with an approximately 21-day core experience cycle split into two game mode phases, followed by a rest stage. Phase I lasts roughly five to ten days, shortening as server purification progress advances. Phase II lasts 11 days, and the endgame challenge of The Sunken Lord unlocks as purification advances.

The culmination, according to Pocket Gamer, is The Sunken Lord, a four-player co-op raid against an enormous island-sized boss. That detail is worth highlighting because it sets a concrete group expectation. If your return plan is to see the full scenario arc, line up a squad or at least follow server progress closely enough to be ready when the endgame opens. The official dev blog also says Isles of Abyss has 12 worlds per server, but the provided sources do not spell out matchmaking behavior for the Sunken Lord encounter. The safe assumption is simple: prepare as if coordination matters.

How to enter, how long it lasts, and what to claim before sailing

NetEase’s dev blog says Isles of Abyss is a PvE scenario available after the October 21 PT maintenance update. After completing character creation and the new player experience, players can sign up from the scenario selection screen. Players already in other scenarios can also sign up through the scenario sign-up screen, with entry rules matching other scenarios. The same dev blog says Isles of Abyss launches without a Vision Tag at first, while a Vision World for Isles of Abyss servers will open later alongside the S5 Vision release.

The scenario’s temporary structure should shape how you approach it. The core cycle is about 21 days, then a rest stage follows. The official dev blog says a Permanent Server for Isles of Abyss is expected to open on November 12, 2026 PT, before the first batch of servers closes, so players can merge into the permanent server. That gives returning players a useful planning window: this is not something you need to finish in one weekend, but phase timing and server purification can affect when content opens.

There are also time-limited launch supplies. The Version 3.1.1 notes say that after the update until November 8 at 2:00 PM PT, players can sign in and claim an Isles of Abyss scenario update celebration supply from their mailbox. NetEase lists the reward as the new Legendary Weapon Blueprint SOCR - Cosmic Visitor, the new Legendary Gear Blueprint Snowline Elite Vest, Starchrom x10,000, a 30-day Meta Pass Trial Card, and limited weapon skins for Howler - DE.50, Howler - MP5, and Howler - EBR-14. The update notes also list common maintenance compensation, including Starchrom x1000, Mitsuko’s Mark x100, a Stardust Secret Crate S15 Epic, and Colorful Badge x30.

If you are coming back cold, check three things before leaving harbor: available storage, mailbox rewards, and your scenario sign-up status. Then expect your first session to be about orientation, ship fundamentals, and resource routes rather than rushing the biggest boss. The Once Human update is live, but Isles of Abyss is structured around a rising tide of hazards, purification progress, and group challenges. Treat it like hostile water, and it should have room to breathe.