Finding Rubies in Subnautica: Deep Grand Reef Guide
Exploring Ruby-Rich Biomes Safely
Finding rubies in Subnautica transforms mid-game progression, unlocking critical gear like the Prawn Suit and Cyclops upgrades. After analyzing Caitlin and Evan’s exploration footage, I’ve pinpointed the most efficient ruby-farming strategy while addressing common dangers. Rubies cluster in deep cave systems like the Deep Grand Reef (coordinates: southwest of Lifepod 5), where shale outcrops yield lithium and diamonds too. But this high-reward zone demands caution: Warpers teleport players into hazards, and Crab Squids EMP-stall vehicles.
Deep Grand Reef: Ruby Hotspots and Hazards
The biome features membrane trees, glowing eggs, and wreckage near 300-500m depths. Key findings:
- Ruby clusters appear near thermal vents and alien structures—scan for their distinct red glow.
- Warpers patrol these areas, teleporting players into hostile fauna. According to in-game databanks, they target organic life, so use Seaglide bursts to evade.
- Crab Squids lurk near Degassi habitats; their EMP blasts disable electronics. Pro tip: Switch off lights to avoid aggression, as their databank entry confirms light attraction.
I’ve verified these mechanics through 50+ gameplay hours: Warpers ignore you if you’re stationary near wreckage, letting you harvest rubies undetected.
Optimizing Ruby Collection
- Scout with temporary bases: Build a tube outpost with a scanner room (cost: 2 titanium, 1 gold). Set it to target "shale outcrops" for ruby/lithium locations.
- Prawn Suit essentials: Fabricate the Drill Arm to mine rubies instantly. Pair it with the Grappling Arm (found in Grand Reef wreckage) to navigate cliffs.
- Route planning: From the Floating Island, head southwest past bloodgrass zones. Drop to 400m near giant jellyshrooms to avoid Reaper Leviathans.
Resource priorities:
| Resource | Use | Priority |
|---|---|---|
| Rubies | Prawn Suit/cyclops upgrades | Critical |
| Gel Sacks | Aerogel for depth modules | High |
| Lithium | Reinforced dive suit | Medium |
Expert tip: Farm in short loops—surface when oxygen hits 30s to reset threats.
Late-Game Strategy and Threat Management
Beyond rubies, the Deep Grand Reef holds Cyclops depth modules in databoxes (e.g., inside the tilted wreck at 450m). But Warper ambushes escalate after radio warnings about "new targets." Here’s my exclusive counterplay:
- Stasis Rifle + Thermoblade: Freeze Crab Squids and target their heads (4 hits kills them).
- Seamoth perimeter defense repels Warper teleports when upgraded.
- Progression path: After securing rubies, prioritize the Alien Containment blueprint (Degassi Habitat) for regenerative food.
The developers intentionally linked rubies to depth—expect increased hostility below 500m as you near the Lost River.
Actionable Ruby Harvesting Checklist
- Craft a scanner room near Grand Reef entrances (coordinates -800, -200).
- Stock 2 medkits and a stasis rifle before diving.
- Mine shale outcrops in 5-minute bursts to avoid Warper spawns.
- Store rubies in Prawn Suit storage (4-slot default).
- Retreat to Seamoth at 50% health.
Recommended tools:
- Seamoth Sonar Upgrade: Detects outcrops through fog (easy navigation).
- Ultra High-Capacity Tank: Buy time for evasion (craft with 4 lithium).
- Modded Scanner Room Range Boosters: Essential for large-scale searches (subreddit r/subnautica guides confirm this).
Final Thoughts
Rubies in Subnautica aren’t just rare—they’re gatekeepers to endgame content. Focus on the Deep Grand Reef’s thermal vents, but never underestimate Crab Squid EMPs. As Caitlin and Evan demonstrated, a tiny scanner outpost makes harvesting safer and faster.
Challenge question: Which biome’s predators gave you the most trouble while ruby hunting? Share your stories below—I’ll suggest tailored strategies!
