In the still waters of Ireland’s Lough Corrib, a silent sentinel of the Viking Age lay hidden for centuries.
Now, the Carrowmoreknock logboat is telling its story.
Beneath the surface of Lough Corrib, Ireland’s second-largest lake, archaeologists have uncovered a vessel unlike any other—a sleek, oak-hewn war canoe dating back nearly a millennium. Known as the Carrowmoreknock logboat, this 6.3-meter-long craft is a rare survivor from the 11th century.
Crafted for Speed, Built for Power
The boat’s design speaks of purpose and precision. Carved from a single oak trunk, it features a rounded hull, a pointed bow, and a stern shaped for swift maneuvering. Five thwarts—wooden seats—once supported a crew of warriors. Two surviving thole pin holes on the gunwale confirm that this vessel was rowed, not paddled, a technological leap in Irish watercraft.
A Warrior’s Vessel
What truly sets the Carrowmoreknock logboat apart is its cargo. Preserved in the silt were:
- Three Viking-style battle axes, their cherry wood handles still intact
- Two iron spearheads
- An iron work axe
- A carved red sandstone slab, possibly destined for a church or grave site
- The remains of oar handles.
- a dagger pommel
- a fossil encrusted stone
A Lake of Legends and Power
Lough Corrib is steeped in myth. Its name may derive from Manannán Mac Lir, the sea god of Irish legend, said to have created the lake with a torrent of water from his grave. The lake’s central narrows, near Knockferry and Kilbeg, have long served as a crossing point—both a gateway and a battleground.
Preservation and Legacy
The boat’s near-perfect preservation is a testament to the lake’s anaerobic conditions in the fine sediment of the lakebed. It was discovered by Trevor Northage, a master mariner whose surveys revealed more than 80 submerged vessels, more than 50 of which are logboats, or thought to be logboats
He had noted an anomaly some time before the investigation and filmed a small straight section of what may have been a hull. Some months later, in his survey boat Burlesque, on the way with the UAU to an excavation of a vessel, he had suggested to the team that they divert to quickly investigate the anomaly which was close by.
The original sonar trace of the Carrowmoreknock boat, before identification (Trevor Northage)
The first video from the Burlesques camera revealed just a small section of hull visible above the sediment. (Trevor Northage)
The UAU and Trevor anchored their vessels close to the target, and two UAU divers entered the water. Some short time later one of them surfaced with a remarkable tale. He had located the gunwale of the vessel, which was intact and visible where they had brushed away the sediment. Because it was so intact the assumption had been made that it was a reasonably modern vessel, so he had made a cursory hand search through the sediment, coming across what he thought was a piece of roof slate or something similar. He had lifted it through the sediment, and to his surprise found himself holding a Viking style war axe.
This was obviously an unintentional method of conducting field archaeology, but it was decided that the best should be made of the situation– meanwhile the other diver surfaced with two more axes, having made exactly the same assumption.
The axes were put into containers of lake water and rushed off for conservation, not before a few photos had been taken though !
Sonar trace of the boat before the dive investigation. The bright spot near the bow of the vessel (near the bottom of the image) was later identified as the sonar return from the axes, deep under the sediment. (Trevor Northage)
The UAU’s subsequent dives have confirmed over 30 ancient logboats so far, each offering a glimpse into Ireland’s aquatic past.
The Corrib Axes are now on permanent display in the National Museum of Ireland.
A Window into the Past
As archaeologists continue to explore the lake’s depths, the Carrowmoreknock logboat remains one of the most evocative finds—a war canoe frozen in time, whispering stories of conflict, ceremony, and craftsmanship.
In the words of Karl Brady, lead archaeologist on the project:
“This boat wasn’t just a means of transport. It was a statement of status, a tool of war, and perhaps even a vessel of ritual. Its survival allows us to touch a moment in history that would otherwise be lost.”
Trevor with one of the axes which he described as “incredibly light and finely made, probably perfect for hand to hand combat”
The Carrowmoreknock boat, excavated, and with thwarts in place.(UAU)
The Corrib Axes, with their Cherrywood handles later retrieved (UAU)