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Hullgrave

Deep-sea colony sim · In development

The surface drowned. Your colony lives in a pressure hull on the sea floor. Build it room by room, keep the air, water and food flowing, send your sub into the dark for salvage, and seal the bulkheads when raider subs clamp onto the hull and cut their way in.

Coming to Steam Press kit

About the game

The surface drowned

Hullgrave is a deep-sea colony sim in side-view pixel art. Build a base room by room in cutaway, keep its air, water, food and power running, send your sub out into the dark for salvage, and hold the bulkheads when raiders clamp onto your hull and cut their way in. The deeper you build, the more there is to take, and the more there is that wants you gone.

Developer
Indie Den
Genre
Deep-sea colony sim
Platforms
Windows (Steam)
Demo
Steam Next Fest, February 2027
Release
TBA
Price
TBA

Build under pressure

  • Over 30 room types, from Oxygen Generators and Algae Farms to Smelteries, Med Bays, Hangars and Drill Shafts
  • Every room drawn in cutaway: watch your crew walk the decks, climb the ladders, work, eat, sleep and fight
  • Keep oxygen, water, food and power in balance; run short and people start to die
  • 50 technologies over four tech levels unlock new rooms, gear and deeper water

Three ways to survive

  • Salvagers: hulls stripped from the wrecks above. Nothing is wasted, nothing is pretty
  • Scientists: a research station that lost the surface and kept studying the deep
  • Survivors: refugees patching leaks with cloth, and somehow still breathing
  • Each faction has its own art for every room, its own ability and a room no one else can build

Into the dark

  • Pilot your sub to salvage fields, kelp, mineral veins and thermal vents, and haul the cargo home
  • Ping the sonar and chart a hex map of the sea floor across six biomes
  • Four depth zones: Sunlight, Twilight, Midnight and the Abyss, each needing stronger hulls
  • Drill the seabed, launch drones and send expeditions to wrecks, trenches and ruins

They come for your air

  • Pirates, Wreckers and the Drowned send raider subs that clamp onto your hull and drill through it
  • Seal bulkheads, staff a Security Post, arm your crew from the Armory and fight room by room
  • Giant squid, anglerfish and eels hunt your sub; lower down, they start hunting the colony
  • Trade with passing convoys, quarantine sick visitors, and keep morale above the waterline
A Hullgrave colony in cutaway: crew at work in the reactor, med bay and labs while a raider sub clamps onto the hull

Follow the dive

Get word when the demo drops

Hullgrave's demo lands in Steam Next Fest, February 2027. Wishlist it and join the Discord for devlogs, playtests and the occasional squid.

Join the Discord