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Only One Earth

The Deep: Earth's Last Unexplored World

Coming soon Course Beginner

Only One Earth

Coming soon

Course

The Deep: Earth's Last Unexplored World

Beginner

This course is still being finished. Tell us you want it and we will let you know when it opens.

Express Interest

More people have walked on the Moon than have visited the deepest ocean. A wonder-first tour of the world below: bioluminescent life, whale falls, hydrothermal vents, crushing pressure, and the creatures that thrive where nothing should.

Topics Deep Ocean Marine Biology Hydrothermal Vents Bioluminescent Creatures Ocean Exploration

4 modules · 12 lessons · first lesson free to preview

The last blue light: leaving the surface world At noon off the coast of Hawaiʻi, sunlight flickers across a diver’s fins as she slips beneath a wind-ruffled surface; within metres, the red of her wetsuit begins to fade, a small proof that the sea is already editing the visible world. Covers how light is absorbed with depth, the broad ocean depth

Pressure: the invisible weight that remakes a body Before dawn in the Mariana Trench, a lander’s lights settle on pale sediment nearly 11 kilometres below the waves; an amphipod darts through the beam, alive beneath pressures more than 1,000 times those at sea level. Explains hydrostatic pressure, why gas-filled spaces fail at depth, and the cellula Unlocks on purchase

A planet moved by one ocean At first light in the Southern Ocean, a wandering albatross skims above slate-grey swells without a wingbeat; below it, dense cold water begins a journey that will help circulate heat, oxygen and nutrients around the globe for centuries. Covers thermohaline circulation, deep-water formation, oxygen Unlocks on purchase

The twilight zone’s nightly migration At dusk in the North Atlantic, the sea beneath a research vessel appears empty until the ship’s echosounder fills with a rising band of life; lanternfish, shrimp and squid are climbing hundreds of metres towards the darkening surface. Covers the diel vertical migration, often described as the larges Unlocks on purchase

Bioluminescence: signals written in cold fire On a moonless night in Monterey Canyon, a comb jelly drifts through black water and releases a brief blue-green shimmer along its body; the flash vanishes almost at once, yet in that instant it has changed what nearby animals can see. Explores how bioluminescence is produced, including luciferin-luc Unlocks on purchase

The black dragon’s lantern At 600 metres in the Gulf of Mexico, a female black dragonfish hangs almost motionless in the water column, her barbel glowing faintly beneath her jaw; she can perceive red light that is effectively invisible to many of the animals around her. Covers deep-sea sensory trade-offs, red bioluminescence Unlocks on purchase

Whale fall: a cathedral built from bone In the Santa Catalina Basin, a whale skeleton rests at 1,240 metres beneath a slow fall of marine snow; an Osedax worm, no larger than a fingernail, extends crimson plumes from a rib and feeds without a mouth. Covers the ecological stages of a whale fall, from scavengers to sulphophilic communities, Unlocks on purchase

Hydrothermal vents: life without sunlight Along the East Pacific Rise, black mineral-rich fluid billows from a chimney into near-freezing water while giant tube worms sway in the current, their bright red plumes carrying the chemistry of an unseen partnership. Explains how seawater circulates through oceanic crust, why vent fluids can emerg Unlocks on purchase

Marine snow: the slow weather of the deep At midnight above the Porcupine Abyssal Plain in the north-east Atlantic, a camera drifts through a quiet fall of white flecks; each particle is a fragment of life from waters thousands of metres overhead, settling at scarcely perceptible speed. Covers marine snow, the biological carbon pump, detrit Unlocks on purchase

Hadal trenches: the narrow valleys of another world On a calm morning in the western Pacific, the research vessel’s horizon is a clean line between silver sea and pale sky; far below its hull, the Challenger Deep drops to nearly 11,000 metres, deeper than Mount Everest is tall. Covers how subduction forms ocean trenches, the distinction between abyss Unlocks on purchase

Seeing without touching: tools for the deep In the Atlantic after a night of rough weather, an ROV descends beneath the last shafts of dawn-blue water, its paired lamps revealing a glass sponge before its mechanical arm pauses short of contact. Introduces remotely operated vehicles, autonomous vehicles, landers, baited cameras, eDNA sampling Unlocks on purchase

The deep sea enters the human story At dawn on a Cornish beach, a child turns a strand of seaweed in the wash while offshore currents carry oxygenated surface water towards depths she will never see; the smallest movement of the tide belongs to the same ocean that feeds vents and trenches. Covers the links between surface activity and Unlocks on purchase

How it works

Two ways to take the course

Both include every lesson. Standard stops there. Voice Mentor adds four phone calls, on days you choose.

Standard

£2.99

The full course, yours to keep. Lessons built from a mix of interactive sections.

Flash cards
Visuals & Imagery
Written prompts
Quizzes
A certificate at the end

Voice Mentor

£19.99

Everything in Standard, plus four mentoring calls on days you choose.

Every lesson, flash card, table, prompt, and quiz
The certificate at the end
Four phone calls
You pick the days
A chance to practice out loud

Why it works

A mentor, just for you

Every call starts from where you are. No recapping, no repeating yourself, no starting over.

It picks up where you left off

Nothing you say gets lost. Each call builds on every one before it, so you keep moving forward instead of going over old ground.

Time goes on your weak spots

It knows the questions you skipped and the quiz answers you missed, so the call is spent where it helps most.

It meets you at your level

Flying through? It pushes you further. Finding it tough? It slows down and tries another way in.

It keeps you on track

Every call is about the part of the course you are on now, not wherever a chat happens to wander.

It makes it stick

Putting an idea into your own words, out loud, turns "I read that" into "I know that".

How it works

From checkout to your first call

No app to install and no link to click. It is a normal call to your phone.

Step 1

Buy the upgrade

Voice Mentor includes the whole course, so there is nothing else to buy.
Step 2

Pick your time

Add your number and choose when the first call rings. The rest follow a week apart.
Step 3

Answer and talk

It quizzes you on that part of the course and gets you explaining it in your own words.
Step 4

Each call builds

The next call is briefed with everything from the calls before it.

Side by side

Our AI Voice Mentor Vs. ChatGPT

ChatGPT is there when you open it and type. Voice Mentor rings you, and it already has this course.

ChatGPT Voice Mentor

Who starts it ✗You open it and type ✓It calls you, when you chose

What it knows ✗Only what you paste in ✓This course and all your work

Memory ✗Each new chat starts at zero ✓Every earlier call, in full

Structure ✗No plan unless you make one ✓A quarter of the course per call

How you learn ✗Easy to skim and feel done ✓You explain it out loud

Cost ✗A monthly subscription ✓£19.99 once, course included

FAQs

A few straight answers

Anything else? Read more about voice mentoring.

Yes. A normal call to your phone number. There is no app to install and no link to click. You just answer.

No. The lessons are yours to read. The call is you explaining the ideas in your own words, while it asks questions and builds on what you say.

Not on its own. Before each call it is sent the summary and full transcript of every call you have had on this course, so nothing gets lost between them.

The course is split into four parts, in order. Each call focuses on the next part, with the rest of the course there for context.

You can still take the call. It sees which prompts you have answered and how long you spent on each lesson, and works from there. It goes better if you have read that part first.

If you know you will be busy, move it before it rings. If one slips past, get in touch and we can usually rebook it. The next call still picks up from everything you have done.

You pick the day and time of the first call. The other three are booked a week apart after it, and you can move any upcoming call to a time that suits you.

It is used only to place your mentoring calls. It is never shared or used for marketing.

For about ninety seconds. Then it is just practice. It does not judge and it does not get bored.

No. Voice Mentor is the full course plus the four calls. Standard is the same lessons, without the phone.

Ready to learn something new?

This course is nearly ready. Tell us you want it and we will let you know when it opens.

Express Interest

The Deep: Earth's Last Unexplored World

Two ways to take the course

£2.99

£19.99

A mentor, just for you

It picks up where you left off

Time goes on your weak spots

It meets you at your level

It keeps you on track

It makes it stick

From checkout to your first call

Buy the upgrade

Pick your time

Answer and talk

Each call builds

Our AI Voice Mentor Vs. ChatGPT

A few straight answers

Ready to learn something new?

The education school forgot

Skills you will actually use

Lessons that hold your attention

A mentor that calls you

Pay once, keep it