Coleraine's Richard Archibald and his Irish lightweight four crew won their repechage on Wednesday morning in the World Rowing Championships at Eton.
Archibald and his team-mates won the repechage at Eton
The victory puts the Irish quartet of Archibald, Gearoid Towey, Eugene Coakley and Paul Griffin into the semi-finals on Friday.
Ireland were almost a length and a half clear of the field over the line as they won in 6.12.91 minutes.
The Irish were surprisingly beaten in their opening heat on Monday.
South Africa matched the Irish crew to the 500m mark but by the halfway point the Irish four had stretched clear by almost a length.
With 250m to go the Irish were four seconds clear of the South Africans who were busy battling with the Austrian four for the second and final qualifying spot.
The South Africans held on to take second place.
The Irish men's lightweight double of Tim Harnedy and Richard Coakley narrowly missed out on qualification for the semi-finals when they finished third in their repechage.
The Skibbereen duo came through the field strongly in the second half of the race but unfortunately they had left their challenge too late and the line came too soon.