New Zealand men's Pair Hamish Bond and Eric Murray smashed the world's best time, previously held by Matthew Pinsent and James Cracknell on the first day of Rowing at London 2012.
Murray and Bond won their heat to qualify for the semi-finals with a victory in 6:08.50.
That time was almost six seconds quicker than the mark Pinsent and Cracknell set at the 2002 World Championships in Seville, Spain.
The pair are unbeaten since teaming up in 2009.
Bond said: 'When we were warming up, we saw there was a nice tailwind and some fast times. Yeah, they were fast conditions but we didn't really have an inclination of how fast we were going.'
Murray added: 'It's a confidence boost for us. We thought we were well prepared but you never know before you get into the finals.
'It's a confidence boost for us - we just have to keep going like that.
'We just wanted to go out there and put our preparation into practice, and show we are really well prepared going into the Olympics.
'I think we have done that but this is only the heat. We are under no illusions. We wanted to go through each step and it was just about getting over the line fast and qualify for the semi-finals.'