When the two whirlpools become entwined, their linked tails form a U-shaped vortex under the water, which can hold together for up to six months before falling apart.
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The Saltstraumen maelstrom holds the Guinness world record for the strongest natural whirlpool in the world. This remarkable Norwegian eddy is estimated to have existed for over 3 millennia, when this coastal region had glaciers in its fjords and channels.
In one tragic event in 1835, a two-masted schooner from Deer Island set sail with two brothers aboard. She went down in the whirlpool while the poor boys' mother watched in horror from shore as the schooner sank helplessly.
Most ships can withstand a whirlpool - not something that's in the general design of an ocean going ship. For a small boat it's best to stay out of the way!
Like whirlpools in the ocean, spinning black holes in space create a swirling torrent around them. However, black holes do not create eddies of wind or water. Rather, they generate disks of gas and dust heated to hundreds of millions of degrees that glow in X-ray light.