A 4,500-year-old log boat is among 12 early Bronze Age, Iron Age and medieval craft that have been located in Lough Corrib, along with several Viking-style battle axes and other weapons.
The vessels were discovered by marine surveyor Capt Trevor Northage while mapping the western lake to update British admiralty charts.
Investigative dives were subsequently carried out last summer by the underwater archaeology unit (UAU) of the National Monuments Service, and radiocarbon dating of samples was then conducted.