A young Cuvier's beaked whale calf surfaces to breath alongside its mother. Credit: Brenda Rone, under NMFS permit #15330.

The Cuvier's beaked whale is the undisputed champion of the long, deep dive. In a study released this week, Erin Falcone and her team recorded a record-shattering dive: one whale held its breath for an astounding two hours and 43 minutes.

"When I first saw the data, I thought 'is there any limit to what this animal can do'?" Falcone tells Axios. (When she recorded a two hours and 17 minute dive in 2014, she said, "it blew us out of the water.")

How they do it: The whales have a number of adaptations to help them hunt beneath the waves. They can almost empty and refill their entire lungs in a single breath. When humans breathe, oxygen is taken from our lungs via a protein called hemoglobin in our blood. Whales have hemoglobin, too — but they have a lot more of it. Both also have myoglobin, another oxygen-storing protein, in their muscles. Cuvier's beaked whales have more myoglobin than most diving mammals and far more than humans. "Their muscles are almost black with myoglobin," says Falcone.

The whales have other ways to conserve oxygen: on deep dives, they temporarily shut down their liver and kidneys and pull blood from their extremities. Their ribs collapse and fold, which helps remove air pockets and makes it easier for them to dive. The whales don't need to swim to reach those depths: they just hold their breath and sink into the black.

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Stocks close down more than 3%

Photo: Alexi Rosenfeld via Getty Images

Stocks took a hit on Wednesday, with the S&P 500, Dow Jones Industrials Average and Nasdaq dropping more than 3% across the board.

Why it matters: The volatility is a break from the stock market grinding higher in the face of spiking coronavirus cases, a stalling economy and gridlocked negotiations over an additional stimulus package.

Zeta, now a Category 2 Hurricane, closes in on Louisiana coast

The probable path of Zeta, per the National Hurricane Center. Photo: NHC/NOAA

Zeta strengthened on Wednesday afternoon, on track to make landfall along the southeastern coast of Louisiana by the afternoon as a "significant" Category 2 hurricane, per the National Hurricane Center.

The state of play: Zeta is producing 100-mph maximum sustained winds and stronger gusts. The storm is gaining strength as it heads northeastward at 20 mph. Louisiana Gov. John Bel Edwards (D) requested a pre-landfall Emergency Declaration in a letter to President Trump on Tuesday.