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OxygenDepthBeginner

Oxygen and depth management

Oxygen is the core survival resource. Plan dives around depth milestones, surface before oxygen becomes a gamble, and upgrade the tank in a deliberate order.

  • Surface when oxygen hits 30% — below that, the return trip becomes a gamble.
  • Upgrade the oxygen tank before the suit; deeper zones are gated by oxygen, not suit pressure.
  • Use air pockets and tanks in deep zones as planned checkpoints, not as bailouts.
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Oxygen upgrade order
News & Guides

Oxygen upgrade order

Upgrade oxygen tank tier 1 as soon as you can afford it, then return to it after every chapter. Tier 2 unlocks the 200m zone, tier 3 unlocks the 250m zone, and tier 4 supports the Glacial Passage and beyond.

  • Tier 1: affordable early
  • Tier 2: unlocks 200m
  • Tier 3-4: Glacial Passage and deeper
Depth milestones and surface rules
News & Guides

Depth milestones and surface rules

Plan dives around depth milestones: 50m, 130m, 200m, 250m. Each milestone unlocks new fish and materials but requires the next oxygen tier. Surface at 30% oxygen to keep the return trip safe.

  • Milestones: 50m, 130m, 200m, 250m
  • Each milestone needs next oxygen tier
  • Surface at 30% oxygen