A tar-like black substance discovered inside a research vessel has led scientists to identify what could be an entirely new branch on the tree of life. What began as routine ship maintenance has evolved into one of the most unexpected microbiology discoveries of recent years.
A Strange Discovery Aboard the Blue Heron
In 2024, crew members working on the research vessel Blue Heron noticed a thick black material leaking from the rudder shaft during repairs at the Great Lakes Shipyard in Cleveland.
The substance resembled tar. It did not ignite when tested with a blowtorch and left no oily sheen on water. Initially, no one suspected it would hold scientific value. A small sample — collected in a paper coffee cup — was sent for laboratory analysis. The remainder was discarded.
That half-cup sample turned out to be extraordinary.
ShipGoo001: DNA From an Unknown Lineage
At the University of Minnesota Duluth’s Large Lakes Observatory, microbiologist Cody Sheik analyzed the material, temporarily naming it ShipGoo001.
The first surprise: it contained DNA.
Genomic sequencing revealed more than twenty reconstructed genomes. Among them was a microorganism representing not just a new species, but potentially a completely new order of archaea — a domain of single-celled organisms distinct from bacteria and complex life forms. Another organism appeared to qualify as an entirely new bacterial phylum.
If confirmed, these microbes would represent previously unknown branches of life.
Some companion organisms matched microbes previously identified in petroleum wells and natural tar deposits, making their presence in a freshwater vessel on Lake Erie particularly puzzling.
How Did Oil-Associated Microbes End Up in a Freshwater Ship?
The newly discovered organisms are anaerobic, meaning they cannot survive in oxygen-rich environments. The Great Lakes themselves are well oxygenated, which initially deepened the mystery.
However, the sealed rudder shaft housing created the perfect microenvironment:
- Oxygen-free
- Warm
- Filled with residual lubricating oil
Researchers believe dormant microbes may have been present in old industrial lubricant and later flourished when environmental conditions shifted. Maintenance records indicate the goo was not observed during the vessel’s 2021 inspection, suggesting rapid growth occurred sometime between 2021 and 2024.
The ship was purchased pre-owned in 1997, and its earlier service history remains incomplete, leaving open questions about the microbes’ original source.
Potential Implications: Biofuel and Corrosion
Beyond its evolutionary significance, ShipGoo001 may have practical applications.
Preliminary analysis suggests some of the organisms produce methane — a capability with potential implications for biofuel research and renewable energy production.
At the same time, scientists are investigating whether these microbes contribute to metal corrosion. Steel structures in the Duluth-Superior Harbor have been deteriorating at unusually high rates, similar to corrosion patterns typically seen in saltwater ports. Whether these newly discovered microorganisms play a role remains under study.
A New Chapter in Microbial Discovery
An external perspective from Boston University emphasized that the importance of new species lies not only in their novelty, but in their genetic history and metabolic capabilities.
For researchers who typically search hydrothermal vents and extreme environments for undiscovered organisms, finding such a significant life form inside a ship’s rudder shaft underscores an important scientific principle:
Innovation in biology can emerge from the most ordinary places.
The genomes of ShipGoo001 were made publicly available in June 2025 to allow further global study. The organism’s temporary name may soon change, but its scientific impact is already clear.
What started as an anonymous smear of black residue has become a discovery that could reshape our understanding of microbial diversity — and expand the known boundaries of life on Earth.
