It was the day Oracle Team USA opened the door to their greatest secret - the performance of their two AC72 catamarans.
But even though Oracle made available all the electronic data previously denied to the challengers, there were few definitive conclusions reached yesterday.
"I've got no idea," said Emirates Team NZ boss Grant Dalton last night. "It's too early to tell; we just started feeding the info in two seconds ago - and we have to get the programmers to check it out."
The likelihood is that little will be gained, even after Oracle's surprise - but welcome - gesture allowing telemetry data to be picked up by the challengers. The issue had been traversed with the jury and Oracle's win there (effectively maintaining that their two-boat racing on the course was just training rather than racing) was a significant victory.
Oracle were allowed access to the data beamed back from the challengers' boats. But when Oracle's two boats trained on the race course, they did not have to send the same telemetry to the challengers. That meant Oracle was the only competitor to know the relative speeds, strengths and weaknesses of all the competing boats.