A dramatic 158th Boat Race had to be halted midway through because of a swimmer in the River Thames, with Cambridge winning the restarted race.
The Oxford and Cambridge boats were side by side after 10 minutes and 30 seconds when the sight of a man in the river forced them to stop.
It was decided the two boats would return to the halfway point to restart.
Cambridge went on to win with ease after Oxford broke an oar in a clash moments after the resumption.
Oxford bow man Alex Woods collapsed in the boat after they crossed the line and was transferred to the race launch for medical treatment, before being taken to Charing Cross Hospital.
The traditional post-race presentation ceremony was abandoned.
"We just thought we should have a little bit of class and keep it low-key," Cambridge's Steve Dudek told BBC Sport. "Our best goes out to Alex, our thoughts are with him."
Cambridge coach Steve Trapmore added: "It's not the way anyone wants to take away the win. We're more worried about the Oxford boat right now and we'll reflect later on what's gone on.
"We've done a lot of preparation for this race, looking at past restarts. I'm very proud of them."
A closely fought race had looked to be heading for an exciting finish going into the final bend, only for a man wearing a black wetsuit to swim in front of the boats and narrowly avoid being hit by the oars of the Oxford crew.
Race umpire John Garrett told BBC Sport: "It was totally unbelievable. We are grateful to Matthew [Pinsent] for spotting the swimmer. We thought it was some debris, then we realised it was a swimmer.
"I wasn't sure if he was going to get out of the way in time, it was quite clear he was waiting for the boats to come across him, so I just had to stop the race."
The swimmer was picked up by a police boat and later arrested on suspicion of a public order offence.
Reserve umpire Pinsent added: "It's not ideal but given those circumstances what could we do? It's a safety issue. Fortunately we spotted him and stopped the race. We couldn't possibly have carried on."
The last time the race had to be restarted was in 2001 when there was a clash of blades.
The two boats headed back to the halfway point and the race restarted after a 31-minute delay, but Oxford's Hanno Wienhausen broke his oar in a clash with Cambridge and the contest was effectively over as eight men took on seven.
Oxford had gone into the race as the defending champions, but Cambridge's victory extended their lead overall in the contest to 81-76.
Cambridge team president David Nelson said: "There was a lot of to-ing and fro-ing up to the [Chiswick Eyot] island and suddenly there was some yelling about an obstruction in the water.
"The next thing I know I see a guy's head between the two boats - and there's 10 or 20 boats following us, so that guy was in serious strife.
"With all the hoo-hah, the restart, the clash, it was a pretty dramatic race."
Official crews for the 158th Boat Race
Cambridge: Bow - Moritz Schramm (91.8kg), 2 - Jack Lindeman (94.6kg), 3 - Mike Thorp (91.8kg), 4 - David Nelson (92.8kg), 5 - Alexander Scharp (95.6kg), 6 - Steve Dudek (109.6kg), 7 - Alex Ross (102kg), Stroke - Niles Garratt (92.2kg), Cox - Ed Bosson (55.6kg)
Oxford: Bow - Alexander Woods (77.8kg), 2 - William Zeng (82.4kg), 3 - Kevin Baum (91.6kg), 4 - Hanno Wienhausen (93.6kg), 5 - Karl Hudspith (91.2kg), 6 - Alex Davidson (94.6kg), 7 - Dan Harvey (79.6kg), Stroke - Roel Haen (96.8kg), Cox - Zoe de Toledo (49.6kg)