‘Saildrone’ Footage Offers Rare Peek Inside a Category 4 Hurricane

The 23-foot crewless vessel pierced the eyewall of Hurricane Sam and captured stunning images as the storm barreled through the Atlantic Ocean.

‘Major’ Oil Spill Off California Coast Threatens Wetlands and Wildlife

A pipeline failure sent at least 126,000 gallons of oil into the Pacific off the coast of Orange County, creating a 13-square-mile slick. Dead fish and birds washed ashore in some areas.

Swimming in an Uncertain Sea

The underwater filmmaker Ron Elliott describes what he’s learned from his encounters with sharks near the Farallon Islands.

La Palma Volcano Lava Hits Ocean, Creating a Pyramid and Toxic Gas Risks

The authorities told residents of the Spanish island to keep their windows shut, warning of powerful chemical reactions as molten rock meets seawater.

Are water landings from space safe?

SpaceX has completed two successful earlier water landings, one at night.

Dancers From the Deep Sea Shine on the U.N. for Climate Week

A Danish arts collective spotlights the bizarrely beautiful siphonophore, which performs a vital role in removing carbon from the atmosphere.

‘Spaceship-Shaped’ Fossil Reveals Hungry Predator of Ancient Oceans

Titanokorys gainesi, turned up in the Canadian Rockies, was among the largest known predators 500 million years ago.

New Research Helps Explain a Sudden Population Crash for Rare Whales

North Atlantic right whales had been making a slow recovery, but ocean changes linked to global warming are pushing down their numbers again, scientists say.

New Research Helps Explain a Sudden Population Crash for Rare Whales

North Atlantic right whales had been making a slow recovery, but ocean changes linked to global warming are pushing down their numbers again, scientists say.

Ida Strengthened Quickly Into a Monster. Here’s How.

Climate change plays a role in the rapid intensification of storms, and in Ida’s case, other factors worked as well to ramp up winds in a matter of hours.

Satellites Spot Oceans Aglow With Trillions of Organisms

A new generation of detectors let scientists identify a dozen large episodes of bioluminescence, one a hundred times larger than Manhattan — and that’s the smallest.

A Performance Piece That Pairs Painted Waves Alongside Real Ones

On view in Newport, R.I., Melissa McGill’s latest is an ode to nature and a reminder of our debt to it.

The Wonders That Live at the Very Bottom of the Sea

Two new books, Edith Widder’s “Below the Edge of Darkness” and Helen Scales’s “The Brilliant Abyss,” explore the darkest reaches and all that glows there.

Learning to Love Solitude (and Hate Oatmeal) on a 15,534-Mile Canadian Trek

For six years, the filmmaker Dianne Whelan hiked, biked, paddled, snowshoed and skied from the Atlantic to the Pacific and north to the Arctic. Here’s what she learned along the way.

Jon Lindbergh, Aviator’s Son Who Took to the Sea, Dies at 88

Family triumph (Charles Lindbergh’s trans-Atlantic flight) and tragedy (the kidnapping “crime of the century”) shaped his early life, but he made his mark in the depths.

With Undersea Robots, an Air Force Navigator Lost Since 1967 Is Found

A recovery mission off Vietnam’s coast showed how advances in technology have given new reach to the Pentagon’s search for American war dead.

In Michigan, a Park Made of Water

The Thunder Bay National Marine Sanctuary is part of a system of underwater reserves around the country. They’re like national parks, but below the surface.

How the Moon ‘Wobble’ Affects Rising Tides

Scientists say it’s less like a wobble and more like a slow, predictable cycle. And while the phenomenon will contribute to rising tides caused by climate change, it is just one of many factors.

Like in ‘Postapocalyptic Movies’: Heat Wave Killed Marine Wildlife en Masse

An early estimate points to a huge die-off along the Pacific Coast, and scientists say rivers farther inland are warming to levels that could be lethal for some kinds of salmon.

It’s Cold in the Ocean but It’s Hotter Inside Sea Otters

To stay warm in frigid seas, the marine mammals rely on an unexpected use of the powerhouses of their cells.