How deep actually is the ocean? We currently know of the Mariana Trench but isn't it possible that there may be deeper places in the unexplored parts of the ocean? Credit: Shutterstock

Mysterious Virus Discovered in Mariana Trench

Peering into the virus's genetic makeup, the research team hinted at the existence of an undiscovered viral family lurking in the ocean's depths.


Beneath the vast expanse of the Pacific Ocean, the Mariana Trench, the world’s deepest known point, conceals life in its cold and lightless depths. “Life has its guardians wherever it exists,” quipped Dr. Min Wang, a marine virologist from the Ocean University of China. “In the Mariana Trench, viruses play that role.”

Dr. Wang, alongside a team of global experts, unveiled a groundbreaking discovery in the journal Microbiology Spectrum. They’ve identified a new virus, sourced from sediments located 8,900 meters below the ocean’s surface. Known as a bacteriophage, this virus preys on and multiplies within bacteria. Interestingly, bacteriophages are not a rarity; in fact, they are arguably the most prevalent life forms globally. “This bacteriophage holds the record for being the deepest ever discovered in our oceans,” Wang proudly announced.

Infecting Deep-Sea Dwellers and Thermal Vent Residents

This newly uncovered virus targets bacteria within the Halomonas group. These bacteria aren’t strangers to challenging living conditions, being residents of both deep-sea sediments and hydrothermal vents — the oceanic equivalent of geysers.

Peering into the virus’s genetic makeup, the research team hinted at the existence of an undiscovered viral family lurking in the ocean’s depths. This exploration has illuminated the rich diversity, evolutionary journey, and intricate genomic features of these profound phages and their bacterial interactions.


Previously, the researchers had embarked on studies using metagenomic analysis, focusing on viruses that infected bacteria from the Oceanospirallales order, which envelopes Halomonas.

Dr. Wang’s ensemble collaborated with another team, steered by marine virologist Dr. Yu-Zhong Zhang. Together, they scoured for viruses within bacterial strains retrieved from the abyss. Dr. Zhang’s expertise lies in uncovering microbial wonders in Earth’s extreme locales, including the icy polar expanses and the enigmatic Mariana Trench.

Understanding the Virus’s Blueprint and Function

Further studies unveiled that the new virus, dubbed vB_HmeY_H4907, thrives in vast oceanic stretches and mirrors its host structurally. A fascinating aspect of this virus is its lysogenic nature — it infiltrates and multiplies within its host, often without destroying the bacterial cell. The virus ensures its genetic legacy endures, passing its genes through successive bacterial generations.


Dr. Wang expressed enthusiasm for the research’s future directions, keen to delve into the intricate dance between these deep-sea viruses and their bacterial hosts. The team is on a quest, hunting for novel viruses in Earth’s harshest realms. “Extreme habitats are goldmines for discovering unprecedented viruses,” Wang emphasized.

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Written by Ivan Petricevic

I've been writing passionately about ancient civilizations, history, alien life, and various other subjects for more than eight years. You may have seen me appear on Discovery Channel's What On Earth series, History Channel's Ancient Aliens, and Gaia's Ancient Civilizations among others.

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