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A ship full of marine scientists is floating over the deepest part of the world: the Pacific Ocean's Mariana Trench. They're sending down probes to study life in one of the most hostile environments on the planet.

This week the researchers are targeting the two deepest spots in the trench — the Sirena Deep and the Challenger Deep — which each extend down about 7 miles beneath the ocean's surface.

The latest word from scientists studying the Arctic is that the polar region is warming twice as fast as the average rise on the rest of the planet. And researchers say the trend isn't letting up. That's the latest from the 2014 Arctic Report Card — a compilation of recent research from more than 60 scientists in 13 countries. The report was released Wednesday by the National Oceanic and Atmospheric Administration.

The National Oceanic and Atmospheric Administration says it has found the remains of a 19th century passenger steamer that sank near the present-day Golden Gate Bridge at the entrance to San Francisco Bay, killing 128 people, mostly immigrants from China and Japan.

Inbound from Hong Kong, the City of Rio de Janeiro, which came to be known as the "Titanic of the Golden Gate," went down in dense fog after hitting submerged rocks early on the morning of Feb. 22, 1901.

U.S. Navy

As the United Nations climate change talks in Lima enter into their second week, one measurement that's coming up a lot is 3.6 degrees Fahrenheit. 

Mystic Aquarium

A new exhibition at Mystic Aquarium in Connecticut is using trash from the ocean to create art. It's an effort to highlight the importance of recycling plastic.

Dean Winter

There's only so much history you can learn from books. Sometimes, you just need to go underwater and travel back in time.

The National Oceanic and Atmospheric Administration is shutting down cod fishing, from Provincetown, Mass., up to the Canadian border, in an effort to reverse plummeting numbers of the iconic fish in the Gulf of Maine.

Starting Thursday, no fishermen — commercial or recreational — may trawl or use certain large nets that might catch cod for the next six months. Local cod fishermen, who now face an uncertain future, say the government hasn't done enough to maintain cod populations, and they challenge NOAA's cod counts.

Oceanographer Ballard Exits Mystic Aquarium After 15 Years

Oct 15, 2014
Inst. for Exploration and Inst. for Archaeological Oceanography

Oceanographer Robert Ballard has ended his 15-year relationship with Mystic Aquarium that exhibited his discoveries of wrecks including John F. Kennedy's PT-109 and the Titanic.

One U.S. Coast Guard sector says it will contact ships that have recently been to Ebola-affected countries to ask whether passengers have symptoms of the virus before they're allowed into port.

Everyone loves dolphins. They're adorable, playful and super-intelligent, often called the geniuses of the ocean.

But recently some researchers have begun to question that last notion. When it comes to brainpower, dolphins might not be as special as you might think.

In a recent piece for New Scientist, Caroline Williams rounds up some of the dissenting opinions.

Eversource

State environmental officials are taking a closer look at the impact of more than two billion gallons of water discharged into Long Island Sound from Connecticut's nuclear plant.

GNY / Creative Commons

Twenty years ago, public perceptions of Long Island Sound weren't good. Mark Tedesco is director of the EPA's LIS office, and during a recent public hearing, he recapped some editorial cartoons from that time.

Dan Reiter, 37, is a long-board surfer and contractor who used to live in Tampa, Fla. Then he discovered the surf breaks along a stretch of coast south of Cape Canaveral. "It's one of the most beautiful places in the world to live and surf and raise your kids," says Reiter, 37, as we watch head-high waves roll into Hightower Beach.

But there's trouble in this coastal paradise. It's on a low-lying barrier island that's getting lower as sea level rises. So the cities here are looking for ways to keep the water at bay or retreat from it.

Titus / YouTube

A fishing ban has been imposed on all commercial and recreational fishing from Norwalk to Milford until the environmental impact of a massive overnight fire in Bridgeport can be evaluated. The fire has also forced evacuation of residents and cut electrical power.

It's been a strong business year for the nation's theme parks, with a notable exception: SeaWorld.

The company, which has parks in San Diego, San Antonio and Orlando, Fla., saw its attendance drop in recent months. The company blames that, in part, on fallout from Blackfish, a documentary film that's critical of SeaWorld's treatment of its captive killer whales.

Richard Taylor / Creative Commons

Fishermen in Long Island Sound won't be allowed to catch lobster for the next three months because of a fishing ban aimed at increasing population numbers.

Decades after the threat of extinction led to them being protected from whalers, there are now about 2,200 blue whales off the West Coast, according to a new study. That's roughly 97 percent of historical levels, say researchers at the University of Washington who call their findings a conservation success story.

What can yesterday's weather tell us about how the climate is changing today? That's what an army of volunteers looking at old ships' logs is trying to answer through the Old Weather project.

One of those volunteers — or citizen scientists, as the project calls them — is Kathy Wendolkowski of Gaithersburg, Md.

Mystic Aquarium

A new viral video depicting a juvenile beluga whale playing peek-a-boo with a child is drawing attention to Mystic Aquarium's arctic animals.

A group of Olympian skiers and snowboarders have been spending time in Hawaii, and they’re not on vacation. These athletes were training by learning to hold their breath and diving dozens of feet under water.

A study by the National Oceanic and Atmospheric Administration or NOAA finds that Atlantic Cod cod stocks have reached the lowest level ever.

Russ Brown, with the NOAA’s Northeast Fisheries Science Center, says after researchers observed declining cod stocks in 2011, counts during the last fishing season showed cod populations continue to slide. 

Discovery Channel set viewership records in 2013 as millions of people tuned in to watch sharks feed, sharks attack, extinct giant sharks and researchers catch and tag sharks. Discovery's "Shark Week" returned on Sunday, and this year, to the dismay of conservationists, restaurants and markets nationwide are feeding the frenzy with a slew of shark meat promotions.

U.S. Fish and Wildlife Service

A first-of-its-kind, large-scale, one day water-testing event took place Wednesday along the Connecticut River and its major tributaries. 

This post was updated at 5:06 a.m. ET Friday:

The National Weather Service has downgraded Hurricane Iselle to a tropical storm. Residents are still warned to take precautions. Strong winds have already knocked out power to parts of Hawaii's Big Island.

This post was updated at 8:45 p.m. ET.

At the moment, Hawaii is forecast to receive a direct hit from a hurricane for the first time in 22 years.

Mystic Seaport

The world’s last wooden whaling ship, the Charles W. Morgan, is back at her dock at Mystic Seaport at the end of her historic 38th voyage. 

Researchers at the Monterey Bay Aquarium Research Institute and the University of Rhode Island published surprising findings of a deep sea octopus that guarded her eggs for 4-½ years. This is the longest brooding period ever recorded by any animal on the planet.

Tropical Storm Bertha is moving northwest, taking aim at Puerto Rico and expected to skirt the Dominican Republic's coast.

The National Hurricane Center has issued a tropical storm warning for Puerto Rico, St. Lucia, Dominica, Martinique, and the U.S. and British Virgin Islands, while the Dominican Republic has issued a tropical storm watch.

Luckily, forecasters with the Hurricane Center say upper level winds are not favorable for further strengthening, so maximum sustained winds should remain at about 50 mph.

Tom Glennon / University of Rhode Island

NASA has begun a new experiment to monitor plankton off the Atlantic coast using boats, airplanes, and satellites.

Seal Pups Return to Ocean After Rehabbing in Mystic

Jul 18, 2014
Mystic Aquarium

Two five-month-old seal pups rescued in March have returned to the Atlantic Ocean after recovering from their injuries at the Mystic Aquarium.

Clark Little photographs ocean waves.

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