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Unknown Oceans

An exploration of everything we haven’t figured out yet.

152 questions, arranged by how far they sit from a settled answer. The further down you go, the less anyone knows.

Begin the descent
Twilight zone200 to 1,000 m

Enough light to see by, not enough to live on. Evidence, with edges still showing.

Midnight zone1,000 to 4,000 m

No sunlight has ever reached this far. These are the questions with no settled answer.

The one question this page namesWhy does anything feel like anything?

We can describe in detail what the brain does when you see red. We cannot explain why any of that activity is accompanied by the experience of seeing red rather than by nothing at all.

Abyssal zone4,000 to 6,000 m

Near freezing, under four hundred atmospheres. Questions that unsettle what sits above them.

Hadal zone6,000 to 11,000 m

Only the trenches reach this deep. Here we may not know what an answer would look like.

Every claim on this site is marked known, uncertain, unknown or possible, and every exploration lists its sources. How that works

Sunlight zone, 0 to 200 m