AP Exclusive: Deep-sea volcano a hotspot for mysterious life

A deep sea shark and several eels are attracted to bait placed at the summit of the Cook seamount, seen from the Pisces V submersible during a dive to the previously unexplored seamount off the coast of Hawaii's Big Island on Sept. 6, 2016. Seamounts are hotspots for marine life because they carry nutrient-rich water upward from the sea floor. (AP Photo/Caleb Jones)
Deep sea coral and sponges sit on the summit of the Cook seamount, seen from the Pisces V submersible during a dive to the previously unexplored underwater volcano off the coast of Hawaii's Big Island on Sept. 6, 2016. The Cook is a 13,000-foot extinct volcano at the bottom of the sea whose summit is 3,000 feet below the surface of the Pacific. (AP Photo/Caleb Jones)
An eel swims between two submersibles on the summit of the Cook seamount, seen from the Pisces V submersible during a dive to the previously unexplored underwater volcano off the coast of Hawaii's Big Island on Sept. 6, 2016. Seamounts are either active or dormant volcanoes that rise dramatically from the bottom of the ocean and never reach the surface. (AP Photo/Caleb Jones)
The Pisces V submersible descends to the Cook seamount, an underwater volcano off the coast of Hawaii's Big Island, on Sept. 7, 2016. Conservation International and the University of Hawaii are exploring seamounts off Hawaii to assess the biodiversity and geological composition of the deep-sea mountains. (Luis Lamar/Conservation International via AP)
The Pisces V submersible sits on the deck of a research vessel during an expedition to previously unexplored seamounts off the coast of Hawaii's Big Island on Sept. 8, 2016. Conservation International and the University of Hawaii are exploring seamounts in the area to assess the biodiversity and geological composition of the deep-sea mountains. (AP Photo/Caleb Jones)
Pisces V submersible pilot Terry Kerby, with the Hawaii Undersea Research Laboratory at the University of Hawaii, loads the deep sea vehicle before a dive to the summit of the Cook seamount, seen from the Pisces V submersible during a dive to the previously unexplored underwater volcano off the coast of Hawaii's Big Island on Sept. 6, 2016. Conservation International and the University of Hawaii are exploring seamounts off Hawaii to assess the biodiversity and geological composition of the deep-sea mountains. (AP Photo/Caleb Jones)
The Pisces V submersible sits on the deck of a research vessel during an expedition to previously unexplored seamounts off the coast of Hawaii's Big Island on Sept. 8, 2016. The group of undersea volcanoes known as the Geologist Seamounts are about 80 million years old and could hold many new animal species, as well as elements such as nickel and cobalt that mining companies could extract. (AP Photo/Caleb Jones)
Conservation International’s Greg Stone, a marine biologist, left, and pilot Terry Kerby, who helps run the Hawaii Undersea Research Laboratory at the University of Hawaii, travel in the Picses V submersible to the summit of the Cook seamount off the coast of Hawaii's Big Island on Sept. 6, 2016. "My goal today is to ... find out what’s living on them, find out how they support ocean life, what their effect is from ocean currents and essentially what drives the ocean, what makes the ocean what it is," Stone said. "Seamounts are a key part of that, and something which humanity knows very little about." (AP Photo/Caleb Jones)
The Pisces IV submersible sits atop the summit of Cook seamount, as seen from the Pisces V craft, during a dive to the previously unexplored underwater volcano off the coast of Hawaii's Big Island on Sept. 6, 2016. "We don’t know anything about the ocean floor," said Peter Seligmann, chairman, CEO and co-founder of Conservation International. "What we know is that each one of those seamounts is a refuge for new species, but we don’t know what they are. We don’t know how they’ve evolved. We don’t know what lessons they have for us." (AP Photo/Caleb Jones)
Robotic arms on the Pisces V submersible open a bag of bait on the Cook seamount during a manned dive to the previously unexplored underwater volcano off the coast of Hawaii's Big Island on Sept. 6, 2016. The Cook seamount is a 13,000-foot extinct volcano at the bottom of the sea whose summit is 3,000 feet below the surface of the Pacific. (AP Photo/Caleb Jones)
A Dumbo octopus swims toward the Pisces V submersible at the summit of the Cook seamount during a dive to the previously unexplored underwater volcano off the coast of Hawaii's Big Island on Sept. 6, 2016. Seamounts are hotspots for marine life because they carry nutrient-rich water upward from the sea floor. (AP Photo/Caleb Jones)
Deep sea coral sits at the summit of the Cook seamount, seen from the Pisces V submersible during a dive to the previously unexplored underwater volcano off the coast of Hawaii's Big Island on Sept. 6, 2016. Seamounts are believed to cover about 18 million square miles of the planet. (AP Photo/Caleb Jones)
An eel swims toward the Pisces V submersible at the summit of the Cook seamount during a dive off the coast of Hawaii's Big Island on Sept. 6, 2016. Seamounts are either active or dormant volcanoes that rise dramatically from the bottom of the ocean and never reach the surface. (AP Photo/Caleb Jones)
Deep sea coral is seen through an observation window of the Pisces V submersible during a dive to the previously unexplored underwater volcano off the coast of Hawaii's Big Island on Sept. 6, 2016. Conservation International and the University of Hawaii are exploring seamounts off Hawaii to assess the biodiversity and geological composition of the deep-sea mountains. (AP Photo/Caleb Jones)
Pisces V submersible pilot Terry Kerby looks through his log at the summit of the Cook seamount during a dive to the previously unexplored underwater volcano off the coast of Hawaii's Big Island on Sept. 6, 2016. Seamounts are believed to cover about 18 million square miles of the planet. (AP Photo/Caleb Jones)
Researcher Sonia Rowley logs coral samples taken from deep ocean seamounts during an expedition to unexplored underwater volcanoes off the coast of Hawaii's Big Island on Sept. 7, 2016. Conservation International and the University of Hawaii are exploring seamounts off Hawaii to assess the biodiversity and geological composition of the deep-sea mountains. (AP Photo/Caleb Jones)
Coral samples taken from deep ocean seamounts sit in a lab aboard a University of Hawaii research vessel during an expedition to unexplored underwater volcanoes off the coast of Hawaii's Big Island on Sept. 7, 2016. A group of undersea volcanoes in the area known as the Geologist Seamounts are about 80 million years old and could hold many new animal species, as well as elements such as nickel and cobalt that mining companies could extract. (AP Photo/Caleb Jones)
Conservation International marine biologist Greg Stone looks at the Pisces V submersible before diving to the summit of the Cook seamount during an expedition to the previously unexplored underwater volcano off the coast of Hawaii's Big Island on Sept. 6, 2016. "My goal today is to ... find out what’s living on them, find out how they support ocean life, what their effect is from ocean currents and essentially what drives the ocean, what makes the ocean what it is," Stone said. "Seamounts are a key part of that, and something which humanity knows very little about." (AP Photo/Caleb Jones)
Dolphins swim next to a transport boat after an expedition to previously unexplored seamounts off the coast of Hawaii's Big Island on Sept. 9, 2016. "We don’t know anything about the ocean floor," said Peter Seligmann, chairman, CEO and co-founder of Conservation International. "What we know is that each one of those seamounts is a refuge for new species, but we don’t know what they are. We don’t know how they’ve evolved. We don’t know what lessons they have for us." (AP Photo/Caleb Jones)

GEOLOGIST SEAMOUNTS, Hawaii — The turquoise waters became darker and darker, and squiggly glow-in-dark marine creatures began to glide past in the inky depths like ghosts.

The three-man submarine went down, down, down into the abyss and drew within sight of something no human had ever laid eyes on: Cook seamount, a 13,000-foot extinct volcano at the bottom of the sea.

Scientists aboard the vessel Pisces V visited the volcano earlier this month to examine its geological features and its rich variety of marine life, and an Associated Press reporter was given exclusive access to the dive. It was the first-ever expedition to the Cook seamount by a manned submersible.

Among other things, the researchers from the University of Hawaii and the nonprofit group Conservation International spotted such wonders as a rare type of octopus with big fins that look like Dumbo's ears, and a potentially new species of violet-hued coral they dubbed Purple Haze.

Conservation International hopes to study 50 seamounts, or undersea volcanoes, over the next five years.

"We don't know anything about the ocean floor," said Peter Seligmann, chairman, CEO and co-founder of Conservation International. "What we know is that each one of those seamounts is a refuge for new species, but we don't know what they are. We don't know how they've evolved. We don't know what lessons they have for us."

During the Sept. 6 dive, the submarine splashed into the water, and as it dove, the only sounds were radio communications from the surface, the hum of an air scrubber that removes carbon dioxide from the passenger chamber, and the voices of the crew. The thick, hot tropical air inside the steel sphere became cooler and drier as the submarine descended.

"We don't know what we're going to find," said Conservation International's Greg Stone, a marine biologist on board. "There will always be the unexpected when you go into the deep ocean."

Halfway to the volcano's summit, which is 3,000 feet below the surface of the Pacific, no sunlight penetrated. The only light that could be seen from the submarine's face-sized windows was the bluish glow of the vessel's own bright lights. Occasionally, bioluminescent creatures drifted past in the darkness.

Stone and subpilot Terry Kerby, who helps run the Hawaii Undersea Research Laboratory at the University of Hawaii, watched as the volcano and its rugged basalt walls hundreds of yards high came into view.

Seamounts are either active or dormant volcanoes that rise dramatically from the bottom of the ocean and never reach the surface. They are hotspots for marine life because they carry nutrient-rich water upward from the sea floor. Seamounts are believed to cover about 18 million square miles of the planet.

Cook, situated over 100 miles southwest of Hawaii's Big Island, is part of a group of undersea volcanoes known as the Geologist Seamounts that are about 80 million years old and could hold many new animal species, as well as elements such as nickel and cobalt that mining companies could extract.

"My goal today is to ... find out what's living on them, find out how they support ocean life, what their effect is from ocean currents and essentially what drives the ocean, what makes the ocean what it is," Stone said. "Seamounts are a key part of that, and something which humanity knows very little about."

Within minutes of the vessel's arrival at the summit, life began to appear — a starfish clinging to a rock, joined shortly after by eels, sharks, chimaera (also known as "ghost sharks"), shrimp, crabs and two rare Dumbo octopuses. One of the octopuses changed color from white to pink to reddish brown as it swam by.

Several types of deep-sea corals were found along the seamount's cliffs, including a vibrant purple one.

"I need to go home, look through the literature ... and also go and run some genetic analyses," said Sonia Rowley, a postdoctoral researcher at the University of Hawaii who is taking part in the project. "But as this is a new seamount ... that no one had dived on before, it won't be any surprise to me whether this is going to be a new species."

Two other seamounts were studied over three days of expeditions: McCall, home to a large number of small deep-sea sharks, and Lo'ihi, an active volcano.

Lo'Ihi has been extensively surveyed by manned submersibles over the past 30 years. The past few times Kerby was there, he saw a large Pacific sleeper shark lurking about the volcano's crater.

As hot vents shot out volcanic gases around them, the team released bait in the water and the 7-foot shark appeared in front of the submarine. Kerby was delighted to see his "old friend."

The team also saw 6-foot eels and a number of new geological formations around the crater. Scientists say Lo'ihi is likely to someday become the newest island in the Hawaii chain as volcanic activity pushes the summit upward.

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Find more stories by AP's Caleb Jones at http://bigstory.ap.org/journalist/caleb-jones . Follow Jones on Twitter: https://twitter.com/CalebAP .

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The story has been corrected to show that the submarine's air scrubber removes carbon dioxide, not carbon monoxide.

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