Bathysphere: Ocean Depths

Bathysphere: Ocean Depths is an educational reference app that takes you from the sunlit surface to the hadal trenches — offline, beautifully designed, and built for curious minds.

PRESSURE LAB
Slide from 0 to 10,994 meters and watch pressure, temperature, light, and ocean zones change in real time. Compare depths to landmarks, explore crush comparisons, and save snapshots to your Depth Journal.

LIFE AT EVERY DEPTH
Browse the Creature Depth Ladder — dozens of species sorted by how deep they live. Filter by bioluminescence, giants, and more. Discover Beautiful Depths: remarkable places from coral reefs to the Mariana Trench.

MACHINES & RECORDS
Follow the Submarine Chronicle through diving history with specs, missions, and depth comparisons. Records Hall covers historic descents, wrecks, freediving milestones, and ocean firsts.

DIVE LITERACY
Six in-depth guides, hand-signal reference, phrase cards, five topic quizzes, and practical calculators for Equivalent Air Depth and best gas mix. Educational tools only — not a substitute for certified training.

SURFACE DESK
Your home dashboard with daily ocean facts, quick actions, exploration progress, weekly challenges, and optional marine weather (wave height and sea surface temperature via Open-Meteo when you enable location).

VIRTUAL DESCENT
Start an educational depth simulation and follow progress on your Lock Screen with Live Activity. Pause, resume, and learn facts as you descend through ocean zones.

WIDGET
Add the Daily Deep Fact widget to your Home Screen for a fresh ocean fact throughout the day.

OFFLINE FIRST
Core content is bundled on your device. Network is optional and used only if you turn on marine weather context.

IMPORTANT
Bathysphere is for learning and reference only. It is not dive planning software, not a dive computer, not medical advice, and not emergency services. Never dive without certified training and proper equipment.

Requires iOS 16.2 or later. Live Activity requires a compatible iPhone.