0 to 200 m
The sunlight zone
Where the light still reaches. Most of the life in the sea crowds into this thin top layer.
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Down to the dark.
Ride the little yellow sub Pip from the waves to the seabed, 4,800 metres below.
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200 to 1,000 m
The twilight zone
The blue fades to grey. Jellies drift past and whole schools rise every night to feed.
1,000 to 4,000 m
The midnight zone
No sunlight at all. From here on, the only light is the one Pip carries.
4,000 to 6,000 m
The abyss
Near-freezing water and hundreds of times the pressure of the air on your shoulders.
On the seabed
The Argo Bell
A cargo steamer lost in a winter storm in 1923, resting upright where no storm can reach her.