A Bizarre Encounter on the Seafloor (Image Credits: Unsplash)
Gulf of Alaska — Researchers who spotted a shimmering golden orb more than two miles underwater faced a puzzle that captivated scientists and the public alike for nearly three years. The object’s unusual shape and glow sparked endless speculation during NOAA expeditions mapping unmapped ocean floors. Persistent analysis finally revealed its true nature, offering a glimpse into the hidden lives of deep-sea creatures and underscoring the challenges of identifying life in extreme environments.[1][2]
A Bizarre Encounter on the Seafloor
On August 30, 2023, during Dive 07 of the Seascape Alaska 5 expedition aboard the NOAA Ship Okeanos Explorer, a remotely operated vehicle named Deep Discoverer stumbled upon the anomaly. The golden orb, roughly 10 centimeters across and dome-shaped with a small hole near its base, clung to a rocky outcrop amid white sponges at about 3,300 meters deep on a small seamount west of Prince of Wales Island. Expedition members immediately noted its striking appearance under the ROV’s lights, dubbing it a potential egg case, dead sponge, or even coral fragment.[1][2]
The team collected the specimen using a suction sampler for shoreside study, as initial observations left them baffled. This discovery occurred as part of broader efforts to map 61 percent of U.S. waters off Alaska, aiding territorial claims and scientific understanding. Public interest surged, with media outlets fueling theories from alien relics to unknown species.[3]
The Long Road to Identification
The sample arrived at NOAA Fisheries’ National Systematics Laboratory, housed at the Smithsonian National Museum of Natural History in Washington, D.C. Scientists there launched an integrative taxonomic investigation, blending hands-on examination with cutting-edge tools. Over more than two years, the process demanded collaboration across morphology experts, geneticists, deep-sea biologists, and bioinformaticians.[1]
Zoologist Allen Collins, Ph.D., director of the lab, reflected on the challenge: “We work on hundreds of different samples and I suspected that our routine processes would clarify the mystery. But this turned into a special case that required focused efforts and expertise of several different individuals. This was a complex mystery that required morphological, genetic, deep-sea and bioinformatics expertise to solve.”[1]
DNA Sequencing Delivers the Verdict
Microscopic analysis first revealed fibrous, layered tissue packed with spirocysts—stinging cells unique to the Hexacorallia group of cnidarians. Initial DNA barcoding proved inconclusive, prompting whole-genome sequencing and mitochondrial genome assembly, along with ultra-conserved elements. These tests matched the orb to genetic material from Relicanthus daphneae, a giant deep-sea anemone.[4][1]
The orb proved to be remnants of dead cells from the anemone’s pedal base, the part that anchored it to rocks. Comparisons confirmed links to a similar 2021 specimen from a Schmidt Ocean Institute expedition and a 2016 NOAA sighting of a live R. daphneae in the Mariana Islands, where a comparable base appeared attached to substrate. Now preserved in the Smithsonian collection, the orb resolved one enigma but highlighted ongoing gaps in deep-sea knowledge.[3]
Unveiling the Giant Anemone’s Secrets
Relicanthus daphneae thrives in crushing pressures, perpetual darkness, and near-freezing waters, growing tentacles over two meters long. It secretes a chitin-based cuticle from its base, which can detach—perhaps during movement, death, or asexual reproduction like pedal laceration, where the upper body relocates and regrows. Such shed remnants linger on the seafloor, potentially fostering microbial communities in the nutrient-scarce abyss.[5]
- Smooth, golden exterior from fibrous tissue rich in cnidocytes.
- Possible role in reproduction or relocation in hard-to-study habitats.
- Rarely observed intact, emphasizing collection’s value for science.
A recent bioRxiv preprint detailed these findings, authored by a team including Collins and Smithsonian invertebrate zoologists. The work stresses how telepresence-enabled exploration, paired with specimen recovery, unlocks biodiversity in the deep ocean.[4]
Why Deep-Sea Exploration Matters
CAPT. William Mowitt, acting director of NOAA Ocean Exploration, emphasized the broader payoff: “So often in deep ocean exploration, we find these captivating mysteries, like the ‘golden orb’. With advanced techniques like DNA sequencing, we are able to solve more and more of them. This is why we keep exploring—to unlock the secrets of the deep and better understand how the ocean and its resources can drive economic growth, strengthen our national security, and sustain our planet.”[1]
This resolution not only demystifies one oddity but reminds researchers of the vast unknowns below. With much of the ocean floor unmapped and species poorly understood, each identification advances fields from medicine to conservation. For the scientists involved, the orb’s story closes a chapter while opening doors to future revelations in Alaska’s profound depths.