The Ocean's Golden Puzzle: How a Mysterious Deep-Sea Orb Stumped Scientists for Nearly Three Years

On August 30, 2023, a remotely operated vehicle named Deep Discoverer was crawling along the seafloor southwest of Walker Seamount in the Gulf of Alaska when its cameras captured something no one on the research vessel above could explain: a smooth, dome-shaped golden object, roughly 10 centimeters across, clinging to a rock more than two miles down [1][2].

"Everyone was like, 'What the heck? What is that?'" recalled Allen Collins, a zoologist at the Smithsonian National Museum of Natural History [3].

The object — quickly dubbed the "golden orb" — became one of the most talked-about marine mysteries of the decade. On April 21, 2026, after nearly three years of laboratory work, researchers finally published their answer: the orb was the abandoned base of Relicanthus daphneae, a giant deep-sea anemone whose tentacles can stretch nearly seven feet [4][5].

The Discovery: Seascape Alaska 5

The golden orb was found during Seascape Alaska 5, the fifth leg of a series of telepresence-enabled ocean exploration expeditions conducted by NOAA aboard the research vessel Okeanos Explorer [6]. From May through September 2023, the ship spent over 160 days at sea mapping and sampling deepwater areas off the U.S. west coast and Alaska, with a focus on the Aleutian Islands, the Gulf of Alaska, and the Aleutian Trench [6].

The Deep Discoverer ROV, capable of diving to 6,000 meters, collected the specimen at a depth of 3,251 meters using a suction sampler [2][5]. The at-sea team shipped it to the Smithsonian National Museum of Natural History in Washington, D.C., expecting a routine identification. That expectation quickly evaporated.

NOAA Ocean Exploration's annual budget stood at $46 million for fiscal year 2023, the same level enacted for 2024 [7]. Specific cost breakdowns for the Seascape Alaska expeditions have not been publicly disclosed, though the broader program encompasses six expeditions annually aboard the Okeanos Explorer along with multiple mapping sonar systems and dual-body ROV operations [6].

A Puzzle That Resisted Easy Answers

Initial guesses from the shipboard science team ranged widely: an egg case, a dead sponge, a coral fragment, or perhaps a microbial biofilm [3][8]. In the lab, the orb offered few conventional anatomical clues. Researchers found "no indication of typical animal anatomy — mouth, gut, muscle tissues — but rather a loose aggregation of fibrous material covered by a smooth, layered surface," according to the preprint posted on bioRxiv [4][5].

Collins described it as "a special case that required focused efforts and expertise of several different individuals" [8]. The identification unfolded in stages:

1. Visual and morphological examination turned up no recognizable body plan.
2. Light microscopy revealed spirocysts — specialized stinging cells found exclusively in Hexacorallia, the subclass that includes sea anemones and stony corals [4][5].
3. Initial DNA extraction proved inconclusive, hampered by contamination and degradation typical of deep-sea specimens [3].
4. Whole-genome sequencing finally yielded usable genetic material, producing complete mitochondrial genomes and Ultra Conserved Elements that matched a known reference genome for Relicanthus daphneae [4][5].

A second, similar specimen — recovered during a 2021 Schmidt Ocean Institute expedition in deep equatorial waters — was also analyzed and confirmed as genetically almost identical to R. daphneae, strengthening the conclusion [5].

The paper, titled "The Curious Case of the Golden Orb," was authored by researchers from the Smithsonian's Department of Invertebrate Zoology and the National Systematics Laboratory at NOAA's National Marine Fisheries Service. As of May 2026, it remains a preprint on bioRxiv and has not yet undergone formal peer review [4].

What Is Relicanthus daphneae?

Relicanthus daphneae is one of the more extraordinary animals in the deep ocean. First described in 2006 by marine biologist Marymegan Daly, the species inhabits the periphery of hydrothermal vents at depths between 1,200 and 4,000 meters, where pressures reach approximately 400 bar — roughly 4,000 tons per square meter [9][10].

Individual polyps can grow to about 30 centimeters across, with pale purple or pink tentacles extending up to 2.1 meters (about seven feet) [5][9]. Those tentacles are armed with the largest spirocysts of any known cnidarian — sticky, adhesive-tipped stinging cells thought to help the anemone snag mobile prey drawn to hydrothermal vent communities, including vent shrimp and other crustaceans [9][10].

The species' taxonomic placement has itself been a source of scientific debate. When first described, R. daphneae was classified as a sea anemone. Subsequent work reclassified it as a non-anemone, before the American Museum of Natural History announced in 2019 that new research placed it back within Actiniaria (the order of sea anemones), possibly as a distinct suborder called Helenmonae [10]. Some researchers still refer to the animal as "anemone-like" rather than committing to a firm classification [3].

The golden orb itself represents what the researchers call "a novel microhabitat": a remnant cuticle — a durable outer layer — that the anemone secreted to attach itself to rock substrate. When the anemone either died or detached, the cuticle remained, its golden coloration preserved, and a distinct microbial community colonized its surface [4][5]. What happened to the rest of the animal remains unknown.

Jon Copley, a marine ecologist not involved in the study, told the Smithsonian Magazine: "From its looks alone, we didn't guess it would be remnants of an anemone-like animal" [3].

How the Golden Orb Fits Among Deep-Sea Discoveries

The identification of the golden orb is not the discovery of a new species. R. daphneae has been known since 2006, and the orb turned out to be a discarded body part rather than a living organism. But the case carries scientific weight for different reasons: it demonstrates how degraded biological material from the deep ocean can confound experts for years, and it reveals a previously unknown aspect of R. daphneae's biology — the shedding and persistence of its basal cuticle.

Other notable deep-sea organism finds offer useful comparisons. In 2012, a joint UK-New Zealand expedition to the Kermadec Trench discovered "supergiant" amphipods measuring up to 34 centimeters — nearly ten times the size of typical amphipods — at depths of 7,000 meters [11]. That discovery expanded scientific understanding of deep-sea gigantism but relied on relatively straightforward morphological identification. The golden orb, by contrast, lacked any recognizable body plan and required genomic tools unavailable a decade earlier.

In 2005, a Census of Marine Life cruise in the Coral Sea recovered Laurentaeglyphea neocaledonica, a crustacean belonging to a lineage thought to have gone extinct 50 million years ago — sometimes called the "Jurassic shrimp" [12]. That identification also required specialist expertise, though the specimen was intact and recognizable as an animal.

The golden orb case is unusual precisely because the specimen was not obviously biological. The two-and-a-half-year timeline from collection to preprint publication is not exceptional by deep-sea taxonomy standards, where formal species descriptions routinely take five to ten years.

The Vast Unknown: Deep-Sea Biodiversity in 2025

The golden orb emerged from a part of the planet that remains almost entirely unseen. A study published in Science Advances in May 2025 calculated that humans have visually observed less than 0.001% of the deep seafloor — an area roughly the size of Rhode Island — despite seven decades of submersible and ROV operations [13].

Source: Science Advances (2025)

Data as of May 7, 2025CSV

The study, conducted by the Ocean Discovery League, analyzed data from approximately 44,000 deep-sea dives since 1958 across the waters of 120 countries. Over 65% of all visual observations have taken place within 200 nautical miles of just three nations: the United States, Japan, and New Zealand [13].

Meanwhile, marine biologists continue to describe new ocean species at a pace of roughly 2,332 per year, though only about 7% of newly described species come from depths greater than 1,000 meters [14]. Scientists estimate that between 75% and 90% of marine species remain undocumented, with the deep ocean representing the largest gap [15].

Source: Frontiers in Marine Science

Data as of Jan 1, 2023CSV

Academic research output on deep-sea species discovery has surged in recent years, peaking at over 10,500 papers in 2023 before stabilizing near that level through 2025 [16].

Source: OpenAlex

Data as of Jan 1, 2026CSV

The Nippon Foundation-Nekton Ocean Census has identified 866 new marine species in recent expeditions, and a 2026 study of the deep Pacific found hundreds of previously unknown species living nearly 4,000 meters below the surface [15].

Skepticism and Open Questions

Several caveats surround the golden orb finding. The identification rests on a preprint that has not yet passed peer review, meaning the methods and conclusions have not been formally vetted by independent experts [4].

The specimen's degraded state raises questions about how confidently it can be attributed to a specific species. Initial DNA testing was inconclusive due to contamination — a common problem with deep-sea biological samples, where microbial overgrowth can overwhelm the target organism's genetic signal [3][4]. The successful whole-genome sequencing resolved this, but some taxonomists may ask whether the mitochondrial genome match could represent a closely related, undescribed species rather than R. daphneae itself.

The taxonomic instability of Relicanthus adds another layer of uncertainty. The genus has been reclassified multiple times — from anemone to non-anemone and back — and its placement within Hexacorallia remains debated [10]. If the higher-order taxonomy shifts again, the identification of the golden orb would need to be revisited.

There is also the question of what the cuticle's existence means for R. daphneae biology. Is shedding the basal cuticle a normal part of the anemone's life cycle — analogous to molting in arthropods — or does it indicate the death and decomposition of the animal? The researchers describe the cuticle as forming "a novel microhabitat" with its own microbial community, suggesting it persists on the seafloor long enough to be ecologically relevant [4]. But whether this is typical behavior or an unusual event remains unknown.

Conservation and the Shadow of Deep-Sea Mining

The Gulf of Alaska, where the golden orb was found, is not currently subject to deep-sea mining operations. But it is increasingly in the crosshairs.

In January 2026, the Bureau of Ocean Energy Management (BOEM) announced it was considering leasing five ocean areas around Alaska for seabed mineral extraction, covering approximately 113.7 million acres [17]. The proposed areas include seamounts in the Gulf of Alaska, waters around the Aleutian Islands, two bays along the western coast, and two areas in the Arctic [17][18].

The Aleutian Island region under consideration is designated critical habitat for threatened Northern sea otters, endangered western Steller sea lions, and endangered West Pacific humpback whales [17]. The waters also support salmon, halibut, crab, and other species central to Alaska Native communities and some of the largest commercial fisheries in the world [18].

Internationally, the International Seabed Authority (ISA) has issued 15-year exploration contracts to 22 contractors for polymetallic nodules, polymetallic sulphides, and cobalt-rich ferromanganese crusts in international waters [19]. No commercial exploitation has been approved, as regulations governing deep-sea mining remain under development [19]. But environmental groups, including Ocean Conservancy, have argued that mining would destroy seafloor habitats and disrupt ocean food webs before science has a chance to document what lives there [18].

The golden orb's discovery site — a rocky outcrop at 3,251 meters in the Gulf of Alaska — sits in the kind of hard-substrate, seamount-associated environment that mining operations target for mineral-rich crusts. Whether the specific coordinates overlap with any proposed BOEM lease area is not clear from publicly available documents.

What Comes Next

The golden orb preprint may take months to clear peer review. If accepted, it would formally document the first known instance of a persistent Relicanthus daphneae cuticle on the seafloor, adding a new dimension to scientific understanding of how deep-sea anemones interact with their environment.

More broadly, the case underscores a recurring theme in deep-sea biology: the ocean floor is producing biological material that existing frameworks struggle to categorize. With less than 0.001% of the deep seafloor visually surveyed, the golden orb is likely one of countless objects sitting on rocks in the dark, waiting for a camera to pass by — and for scientists to spend years figuring out what they are.