The Ocean Deep
Like Duolingo, but for The Ocean Deep. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
For the part of you with thirty open tabs that never became anything.
54 levels across 4 sections, about 108 minutes end to end, roughly 22 days at five minutes a day. It moves through Layers of the Sea, Living in the Dark, The Ocean Floor, and Exploring the Unknown. It starts from scratch.
Free forever · No credit card · iPhone & Android

Key ideas in The Ocean Deep
- Photosynthesis stops below the sunlit zone
- Photosynthesis provides chemical energy
- Phytoplankton are the base of the food web
- Total darkness prevents primary production
- The Epipelagic zone is the only zone with sufficient light for photosynthesis
- Phytoplankton biomass eventually sinks
- Why the surface layer is the primary energy engine
- Deep-sea life depends on nutrients falling from the sunny surface
- Light intensity decreases rapidly with depth
- How sunlight availability dictates the roles of different organisms
- Sunlight is the initial input
- Why the surface layer is the primary energy engine for the ocean
- Energy moves from producers to consumers
- The flow of energy starting from the sun through the surface ecosystem
- The specific role of phytoplankton in supporting life below the surface
- The relationship between depth and photosynthetic capability
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives The Ocean Deep the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
What treasure does photosynthesis provide to the rest of the ocean's hungry crew, matey?
Get it right to open this lesson and 53 more in the app.
Where The Ocean Deep takes you
Dive beneath the waves to discover the mysterious world of the deep sea. Learn about strange glowing creatures, massive underwater mountains, and how life survives in the dark.
- 1
Layers of the Sea
- The Sunny Surface
- The Twilight Zone
- The Midnight Zone
- The Bottomless Trenches
- 2
Living in the Dark
- Animals That Make Their Own Light
- Surviving Huge Water Pressure
- Finding Food in the Deep
- Giant Squid and Deep Sea Monsters
- How Deep Sea Fish See
- Slow Motion Life Under Water
- 3
The Ocean Floor
- Underwater Volcanoes
- Hot Springs on the Sea Floor
- Mountains Taller Than Everest
- 4
Exploring the Unknown
- Deep Sea Submarines
- Robot Explorers
- Mapping the Dark
- Why We Know More About Space
- Protecting the Deep Ocean
4 sections · 18 units · 54 levels. Built to play, not to enroll.
You pick the voice
The Ocean Deep is taught in the The Pirate style: arr, learning be an adventure!. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start The Ocean Deep today.
Download Tomo, search The Ocean Deep, and play your first lesson in under a minute.