SANTIAGO, CHILE — While most people would struggle to remain in near-freezing water for even a few minutes, Chilean extreme swimmer Bárbara Hernández has spent years pushing her body to extraordinary limits — becoming one of the most recognizable figures in ice swimming and putting Chile on the international map for the demanding sport.
Known worldwide as the “Ice Mermaid,” Hernández has built her reputation through record-breaking swims in Antarctica and the frigid waterways of southern Chile, where exposure to dangerously low temperatures makes every stroke a test of physical endurance, mental discipline and survival.
Her story is the subject of a Bloomberg feature published on October 9, examining her role in promoting ice swimming in Chile and drawing attention to a sport that remains relatively unfamiliar to mainstream audiences.
But beyond records and international recognition, Hernández has another goal: encouraging people to care about the oceans, glaciers and fragile natural environments where she competes.
A record-breaking swim in Antarctica
One of Hernández’s defining achievements came on February 5, 2023, when she completed a 2.5-kilometer swim in Antarctic waters near Greenwich Island in the South Shetland Islands.
With water temperatures close to 2.2°C, she completed the challenge in approximately 45 minutes, wearing a conventional swimsuit, swimming cap and goggles rather than a protective wetsuit.
The achievement was subsequently recognized by Guinness World Records as the longest polar ice swim by a woman.
The challenge demonstrated both her extraordinary endurance and the severe risks associated with extreme cold-water exposure.
Her 2025 record raised the bar even higher
Hernández continued breaking barriers in August 2025, when she completed an even longer swim in Canal Señoret, near Puerto Natales in southern Chile.
Distance
3.84 km
Women’s ice-swimming record
Water temperature
4.53°C
Average during the swim
Completion time
1:06:15
Hours, minutes, seconds
Record date
Aug. 30, 2025
Puerto Natales, Chile
Source: Guinness World Records and International Ice Swimming Association.
The performance surpassed Polish swimmer Izabela Babica’s previous women’s benchmark of 3.54 kilometers and was officially recognized by Guinness World Records.
Hernández completed the distance without a wetsuit or insulating grease, under a medical safety protocol supported by specialists monitoring her condition.
Her club, Universidad Católica, later reported that she had experienced hypothermia and difficulty remembering the final part of the swim — underscoring just how dangerous this sporting discipline can become.
From Antarctic records to the world’s seven oceans
Hernández’s achievements extend well beyond ice swimming.
In June 2024, she became the first South American to complete the Ocean’s Seven, a marathon-swimming challenge involving seven of the world’s most demanding open-water channel crossings.
The routes include the English Channel, Catalina Channel, Cook Strait and Japan’s Tsugaru Strait.
Completing the challenge requires athletes to overcome unpredictable currents, changing weather, exhaustion and sometimes dangerous marine conditions.
Her final crossing took place in Japan, where she completed the Tsugaru Strait swim after more than 11 hours in the water.
Her achievements continued into 2026.
In May, Chilean swimming outlet SwimChile reported that Hernández had been inducted into the International Marathon Swimming Hall of Fame, recognizing her endurance achievements and contribution to open-water swimming.
In August, FMDOS reported that she completed a double crossing of California’s Catalina Channel, spending almost 24 hours swimming. The outlet described her as the first Latin American woman to accomplish that particular feat.
The bigger mission: protecting oceans and glaciers
For Hernández, swimming through extraordinary natural environments carries a message beyond sporting success.
In a February 2026 interview published by Chile’s official tourism platform, Chile Travel, she emphasized the importance of helping people connect emotionally with nature.
Her environmental advocacy is rooted in the belief that personal experiences with natural places can encourage people to protect them.
Her journeys have taken her through some of the planet’s most visually striking yet environmentally sensitive waters, from Antarctic coastlines to Chilean glacier regions.
The connection between sport and environmental awareness is particularly relevant as rising temperatures and changing marine environments create long-term challenges for polar ecosystems.
By sharing her experiences, Hernández is helping bring public attention to places that many people will never visit themselves.
Can Chile become a bigger force in ice swimming?
Hernández’s growing international recognition could help inspire greater interest in cold-water swimming across Chile.
The country has remarkable natural settings for the discipline, particularly in Patagonia and the far south, but the sport requires strict safety standards, experienced supervision and specialized medical support.
The International Ice Swimming Association defines qualifying ice swims as taking place in water below 5°C, with restrictions on thermal protection.
Such conditions can cause cold shock, loss of muscle control and potentially life-threatening hypothermia. Hernández’s own experiences demonstrate why record attempts should never be confused with recreational cold-water swimming.
While her individual achievements have already elevated Chile’s profile, whether that visibility translates into broader participation, organized events and sustained institutional support remains an open question.
A legacy bigger than medals
Hernández’s story reflects a combination of athletic ambition, personal perseverance and environmental advocacy.
She has moved from growing up in Santiago, far from the sea, to becoming an internationally recognized marathon and ice swimmer.
Her success has also been recognized beyond the sporting world. In March 2026, Chilean organization ComunidadMujer honored her with a career achievement award for her contributions and leadership.
For an athlete whose career has taken her into some of Earth’s coldest waters, the next challenge may not simply be swimming farther or breaking another record.
It may be using her international platform to inspire a new generation of swimmers while encouraging greater appreciation of the natural environments that make her extraordinary achievements possible.
And that may ultimately become the Ice Mermaid’s most enduring legacy.
