The ocean has more night than it has day.
Below two hundred metres the sun gives up entirely. What follows is the largest habitat on earth — dark, cold, patient — and you are dropping through it in a steel sphere the size of a small car. Scroll to sink. The light will not follow you.
Here the light is a rumor told by fish.
The last blue fades to a permanent dusk. Lanternfish stage the world's largest migration every single night, rising toward the surface and sinking again before dawn — a commute of billions, invisible from above.
Abyssal plain ahead. Weather is irrelevant now.
Pressure: 240 atmospheres — the weight of a small car pressing on your thumbnail. And still: life. Siphonophore chains like drifting strings of lights, dumbo octopuses flapping through the black with ears like a cartoon.
Something enormous says hello in clicks.
Sperm whales hunt here a kilometre down, navigating and shouting in pulses that rattle the hull. Your sonar answers politely. It is the only conversation for a thousand kilometres in any direction.
Touchdown. The oldest dark on earth.
The vent field glows on the monitors — black smokers pumping mineral smoke at temperatures that would flash-boil the sub, surrounded by tube worms and blind crabs farming bacteria that eat chemistry instead of light. Life never needed the sun. It just preferred it.