How much RAM does an FTB OceanBlock 2 server need?

6 GB, which is FTB's own recommended figure for this pack against a 4 GB minimum. It holds up well for a group of around six because ocean is cheap to generate compared with varied terrain, so most of your memory goes to what players build rather than to the world itself. Heavy automation later in the pack is what pushes it up.

Does each player get their own island?

No. Unlike FTB Skies, which creates a dimension per team, OceanBlock 2 puts everyone in one shared ocean world. That makes exploring a group activity and finding structures worth sharing, but it also means bases need sensible spacing. Talk about where people are building before everyone spreads out, and use FTB Chunks claims so nobody builds over someone else's setup.

Do I need to pregenerate the world?

Less than on a land pack. Ocean is much cheaper to generate than varied terrain, so players traveling across it costs the server relatively little, and the pack ships no pregeneration mod anyway. If you do see hitching while someone explores, it is usually a custom structure generating rather than the water itself, and that is not something you can avoid in advance.

Why did our machines stop while nobody was online?

FTB Chunks is shipped so force-loaded chunks only tick while someone on that team is connected. Open the FTB Chunks server config, find the `force_loading` group and set `force_load_mode` to `ALWAYS`, then restart. On a world that already exists the live file is under `world/serverconfig`, not the one in `defaultconfigs`, which only applies when a world is first created.

Why do players die as soon as they go deep?

That is the pack working as designed. The deep ocean will kill an unequipped player, and surviving it requires a pressurized diving suit built through the questline. If someone is dying repeatedly at depth, they have skipped ahead of their gear rather than hit a bug. The quest book is the guide here, and it is worth pointing new players at it early.

Can we keep our world when a new version is released?

Normally yes, and the panel keeps the world and offers a backup during the update. The pack is still actively developed, so check the changelog for removed mods before you jump, since anything dropped from the pack takes its blocks out of your base with it. Update every player's client on the same day so nobody is locked out.

Minecraft modpack · Feed the Beast

FTB OceanBlock 2 Server Hosting

by FTB Team

NeoForgeMinecraft 1.21.1Java 21

How install works

One-click install from the Modpacks tab once your server is ready

Recommended RAM: 6 GB
Latest build: 1.21.1Aug 2026
Mod loader: NeoForge1.21.1
Downloads: 1.3MFeed the Beast

FTB OceanBlock 2 opens with your escape pod in pieces on a planet that is nothing but ocean. There is no land, no rescue, and something under the water that does not want you there. It is a skyblock-shaped premise in that you begin with nothing and build a platform outward, but the fiction and the progression are doing much more work than that comparison suggests.

You scavenge debris, automate the basics, and build a power base on the surface. Then the pack turns downward. Going deep needs a pressurized diving suit, because the crushing depths will kill you otherwise, and the technology to survive them is the spine of the progression. Custom structures are scattered across the ocean to find, and the questline carries a genuine story about why you are stuck here.

For a server that gives you something the FTB skyblocks do not: a shared map. Everyone is on the same ocean, so exploring is a group activity and finding a structure is worth telling people about. It runs on NeoForge 1.21.1 and suits groups who want progression with a direction rather than a sandbox.

Hosting FTB OceanBlock 2

6 GB, which is FTB's own recommendation

FTB publish 6 GB as recommended for OceanBlock 2, with 4 GB as the minimum, and we set the recommended figure. For a group of around six that is a fair fit, helped by the fact that the world is mostly water and therefore cheap compared with a terrain-heavy overworld pack.

One shared ocean, not an island each

Worth knowing if you have run FTB Skies: OceanBlock 2 does not give each team its own dimension. Everyone shares one world, which changes how you plan the server. Bases need spacing so machine-heavy areas are not stacked on top of each other, and it is worth agreeing early roughly where people are building.

It also means claims matter for real reasons rather than as bookkeeping. FTB Chunks and FTB Teams ship with the pack, and the default that catches every FTB server out applies here too: force-loaded chunks tick only while a team member is online. Set force_load_mode to ALWAYS in the FTB Chunks server config if you want automation running overnight, editing the copy under world/serverconfig once the world exists.

What the load actually is

Ocean generates far more cheaply than varied terrain, so exploring costs less here than on a normal pack, and the pack ships no pregeneration mod. The cost lands on bases: machines, fluid systems and the structures people build out over the water. ServerCore is included, and spark is there when you need to know what is really happening:

/spark profiler --timeout 120

Java and updating

Minecraft 1.21.1 means Java 21, chosen for you at install. The pack is actively developed, so read the changelog before updating a world your group has invested in, take the backup the panel offers, and move everyone's client together.

RAM

6 GB, FTB's recommended spec

FTB's own published figure for the pack, with 4 GB as their listed minimum.

World

One ocean, shared by everyone

Unlike FTB Skies there is no dimension per team, so plan where bases go before people spread out.

Progression

Depth needs equipment

The crushing depths kill an unprepared player, so the diving suit gates the second half of the pack.

How to install FTB OceanBlock 2 on your server

1
Order the server
The button on this page preselects the RAM this pack needs. It is online about a minute after checkout.
2
Open the Modpacks tab and search FTB OceanBlock 2
In the panel's Modpacks tab, search for OceanBlock and pick FTB OceanBlock 2 from Feed the Beast, then choose build 1.21.1.
3
Press install and wait
The panel downloads the server pack, installs the loader and the right Java version, then restarts.
4
Join with the same build
Everyone installs the same pack build in their launcher, then connects to the address on the Overview tab.

Available builds

Build	Minecraft	Loader	Released	Installable
1.21.1	1.21.1	NeoForge	Aug 24, 2026	Installable
v1.21.0	1.21.1	NeoForge	Aug 21, 2026	Installable
v1.20.0	1.21.1	NeoForge	Aug 8, 2026	Installable
v1.19.0	1.21.1	NeoForge	Jul 6, 2026	Installable
v1.18.4	1.21.1	NeoForge	Jun 21, 2026	Installable