All items recovered are being sent to the National Museum of Ireland in Dublin for identification.
Three swords, a helmet, spears, guns and a cannonball have been discovered in the River Shannon in the last year.
Offaly Sub Aqua Club, who are scouring the river-bed for artefacts, believe it's the first time such a project has been undertaken in the area.
All items recovered are being sent to the National Museum of Ireland in Dublin for identification.
Noel Guerin is part of the search team and explains how difficult it is to spot the artefacts:
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