New images from exploration voyages show how weird and wild it is under the sea.

Pictures taken of never-before-seen areas, especially off the eastern Pacific, show what looks like an imaginary world.

There's a delicate jellyfish, an eel with a strange head and a purple disco ball-like critter. And just in time for Halloween, there's a rare purple vampire squid, nicknamed for its red eyes and deep colour.

A fish of the family Aphyonidae. Photo / AP
A fish of the family Aphyonidae. Photo / AP

The images are being shown as part of the National Ocean Exploration Forum this week in New York.

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"We're continually surprised by the variety of life that we find and what we're seeing," said Nicole Raineault, science operations director at the Ocean Exploration Trust.

An acorn worm. Photo / AP
An acorn worm. Photo / AP

"It just underscores ... how much more there is to discover out there."

National Oceanic and Atmospheric Administration undersea exploration off the Pacific coast found hundreds of undersea vents spewing methane - a potent heat-trapping gas - that scientists didn't know existed, said Bob Embley, a NOAA senior research scientist.