The mightiest waterfall,
Flowing floods
Of fresh living water;
It flows unseen,
Beneath the surface,
Through the oceans;

No eye has seen,
No ear has heard
Its waters rushing
From deep unto deep,
Bringing refreshment,
Feeding new life.

It fuels the currents
Of the seas;
Its torrents
Bring purity
To the depths,
And crystal clarity,
Banishing the murk.

‘Deep calls to deep
in the roar of your waterfalls;
all your waves and breakers
have swept over me.’

– Psalm 42:7

Until you see one, it’s hard to imagine the size and power of the world’s most impressive waterfalls. Six million cubic feet of water—enough to fill more than sixty Olympic-sized swimming pools—goes over Niagara Falls, between New York and Canada, every minute. That’s enough to produce four million kilowatts of electricity. But what if no one ever saw it, because it’s miles beneath the North Atlantic Ocean?

Cold water is denser than hot water (its molecules are bouncing around less, so they need less space), so it tends to sink. When cold-water basins pour into slightly warmer ones, their water plunges straight down, just like at Niagara—only slightly slower, much more quietly and almost invisibly, since it all happens underwater.

The world’s largest underwater waterfall, flows down the western side of the Denmark Strait, known as the Denmark Strait cataract.

The amazing thing about the Denmark Strait cataract is that it dwarfs anything you’d see above the waves. Its water drops almost 11,500 feet, more than three times the height of Angel Falls in Venezuela, normally considered Earth’s tallest waterfall. And the amount of water it carries is estimated at 175 million cubic feet of water per second. That’s equivalent to almost two thousand Niagaras at their peak flow.

Underwater Waterfall

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