The White Shark Café: The Great White's Secret Life in the Middle of the Pacific

10 July 2026 | White Shark Ocean

Every autumn, after months of gorging on seals and sea lions along the California coast and around Guadalupe Island, great white sharks do something that baffled scientists for years: they leave. Not to another coastline. Not to a richer feeding ground. They swim 2,000 kilometres out into the open Pacific Ocean and disappear into one of the emptiest stretches of water on the planet, staying for months before returning.

The place they go has a name. Scientists call it the White Shark Café — and what happens there is still not fully understood.

Finding the Café

The White Shark Café was discovered in the early 2000s, not by anyone diving there or sailing through it, but by satellite tags attached to great white sharks off the California coast. As the data came in, researchers at Stanford University and the Monterey Bay Aquarium noticed the same pattern repeating: sharks that had been tracked feeding near the Farallon Islands, Ano Nuevo, and Guadalupe Island would, in late autumn, begin moving southwest. Not along the coast. Straight out into open ocean. Two thousand kilometres out, they would stop moving purposefully and begin behaving differently — clustering in a roughly defined area about the size of the state of Colorado, positioned roughly halfway between Baja California and Hawaii.

The researcher Scott Anderson, who had spent years tagging great whites off the California coast, coined the name. The Café stuck. On a map, the location looks like nothing: a patch of subtropical Pacific, 20 to 25 degrees north latitude, 140 to 145 degrees west longitude, far from any coastline, any known prey population, any obvious reason for a 1,000-kilogram predator to be there at all.

What the Sharks Do There

The tagging data that revealed the Café's existence also revealed something stranger about the behaviour of the sharks once they arrived. Rather than staying near the surface or cruising the water column in the patterns seen on the coast, the sharks began making extraordinary vertical journeys.

Male great whites in the Café perform what researchers describe as yo-yo dives: from the surface down to 400 or 500 metres, then back up to the surface, repeated 100 to 200 times per day. This is not casual movement. Descending to 500 metres and returning in a single dive cycle, repeated continuously throughout the day and night, represents an enormous and sustained energy expenditure for an animal that has, by this point, left its primary food sources far behind. The males concentrate these dives in a specific depth band, returning to the same depth range in a pattern that suggests they are targeting something there.

Female great whites in the Café behave differently. Rather than the males' relentless vertical cycling, females follow a pattern called diel vertical migration — staying relatively shallow during the night, then diving deep (400 to 600 metres or more) during the day. This pattern precisely matches the daily commute of the deep scattering layer: the vast community of fish, squid, and crustaceans that rise toward the surface after dark to feed and sink to depth during daylight to avoid their own predators. Female great whites appear to be following the movement of their food source.

The male behaviour is harder to explain. Their dives are faster, more frequent, and concentrated in a depth band that doesn't obviously match prey movements. Two leading hypotheses have emerged: that males are either feeding on different, deeper prey that females are not targeting, or that their diving behaviour is related to reproduction — some kind of display or signalling function that occurs in the proximity of females who are themselves passing through the area.

The 2018 Expedition

For years after the Café's discovery, scientists knew where it was and what the sharks were doing there, but not why. The open Pacific offered no easy answers from the surface. In April and May 2018, an interdisciplinary team from Stanford University's Hopkins Marine Station, the Monterey Bay Aquarium, the Monterey Bay Aquarium Research Institute (MBARI), and the Schmidt Ocean Institute mounted a dedicated month-long research cruise aboard the research vessel Falkor to find out what was actually down there.

What they found challenged the assumption that the Café was an oceanic desert — a featureless, nutrient-poor expanse that sharks were simply passing through for reasons unrelated to food. The area turned out to be far more biologically productive than satellite images had suggested. The expedition found layered phytoplankton blooms, a rich and diverse deep-sea community, and environmental DNA signatures that indicated the presence of squid and other prey species in the water column at depths consistent with the sharks' diving behaviour.

The team recovered data from 16 tags in total. The analysis confirmed that female sharks were tracking the diel vertical migration of the deep scattering layer: their dive timings matched the daily movements of prey species with a precision that could not be coincidental. The females, it appeared, had found an abundant and largely unexploited food source in a patch of ocean that no other large predator was consistently visiting.

The male diving pattern remained harder to decode. The data showed males making their yo-yo dives both day and night — unlike the females whose timing tracked the light cycle. This is inconsistent with simply following the deep scattering layer, which moves predictably with light. The male behaviour looks less like feeding and more like searching.

How Long They Stay

The seasonal timeline of Café visits differs substantially between sexes. Male great whites typically spend six to eight months at the Café before returning to coastal waters. Female great whites stay considerably longer — in some tracked individuals, up to 18 to 20 months — and range more broadly across the central Pacific rather than concentrating as tightly in the Café's core as males do.

This difference in residency time is itself informative. If the Café were simply a waypoint — a navigational landmark or a brief stop — both sexes would pass through on similar timescales. The fact that females invest more than a year in the open Pacific, feeding along the way, suggests the central Pacific is a genuinely important foraging habitat rather than a transit corridor. Females returning from 18-month absences are coming back from somewhere that sustained them, not from somewhere they were simply waiting.

This has implications for how scientists and conservation managers think about great white habitat. The California and Guadalupe Island feeding grounds are well-studied and receive attention. The Café received almost none until the tagging data forced the question. A shark that spends more than half its year in open ocean is not primarily a coastal animal — it is an oceanic animal that uses coastlines seasonally.

What the Café Still Doesn't Reveal

The 2018 expedition answered some questions and deepened others. The Café is not empty — that much is now clear. Female feeding on the deep scattering layer is the most credible explanation for female behaviour there. But the male diving pattern remains unexplained to the satisfaction of the researchers who have studied it most closely.

Nobody has yet observed great white sharks mating. In all the years of cage diving, tagging, and research around Guadalupe Island, the Farallons, Gansbaai, and Mossel Bay, no documented mating event between great whites has ever been recorded. Some researchers believe the Café may be a mating aggregation — that the dense, sustained presence of males performing energetically expensive behaviours in the vicinity of females is related to reproduction in a way the tag data alone cannot confirm. Others are unconvinced, noting that the female residency patterns don't obviously fit a mating scenario.

What is clear is that a 1,000-kilometre ocean crossing to spend months in the open Pacific, performing hundreds of deep dives per day, costs an enormous amount of energy. Whatever is happening in the White Shark Café matters enough to the sharks that it is worth that cost. That alone makes it worth understanding.

Great white sharks are ocean-basin animals whose lives extend far beyond the coast where we encounter them. White Shark Ocean operates cage diving and surface encounters in Mossel Bay, South Africa. Book at whitesharkocean.com.

Frequently Asked Questions

What is the White Shark Café?

The White Shark Café is the informal name for a remote area of the North Pacific Ocean, roughly the size of Colorado and situated approximately halfway between Baja California, Mexico, and the Hawaiian Islands. It is an annual aggregation site for adult great white sharks from the eastern Pacific population, who leave their coastal feeding grounds in California and Mexico each autumn and congregate in this area for months before returning. The name was coined by shark researcher Scott Anderson and has been used in scientific literature since the early 2000s.

Why do great white sharks go to the White Shark Café?

Research, particularly from a major 2018 expedition by the Monterey Bay Aquarium, Stanford University, and MBARI, suggests that the Café is not the oceanic desert it was once assumed to be. Female great white sharks appear to be feeding on the deep scattering layer — the daily vertical migration of squid, fish, and crustaceans that rise to the surface at night and sink during the day. Female diving patterns match this prey movement precisely. Male behaviour, involving 100 to 200 yo-yo dives per day to depths of 400 to 500 metres, is less fully explained and may be related to reproduction, different prey, or both.

How deep do great white sharks dive at the White Shark Café?

At the White Shark Café, great white sharks have been recorded diving to depths of 400 to 600 metres and, in some cases, deeper still. Males perform these dives 100 to 200 times per day, both day and night, in a sustained yo-yo pattern between the surface and their preferred depth band. Females dive primarily during daylight hours, following the movement of the deep scattering layer. These depths are significantly greater than those typically recorded during coastal feeding behaviour, where great whites tend to operate in the upper 50 metres of the water column.

How long do great white sharks stay at the White Shark Café?

The duration varies significantly by sex. Male great white sharks typically spend six to eight months at the Café. Female great whites remain considerably longer — satellite tracking data has recorded some females spending 18 to 20 months in the open central Pacific before returning to coastal waters. Females also range more broadly across the Pacific rather than clustering as tightly as males within the Café's core area.

Is the White Shark Café a protected area?

The White Shark Café falls within international waters and is not currently under dedicated marine protection. The 2018 research expedition was partly motivated by a desire to generate the ecological data needed to make a case for some form of protection for the area. Given that the Café appears to be a critical habitat — potentially a feeding ground and possibly a mating area — for the eastern Pacific great white shark population, researchers have argued that its conservation status deserves serious consideration. As of 2026, no formal protected status has been established.