representative in her home country. Looking to expand that. >> Getting away nicely in lane 4 was Gaffney. It's how she uses her underwater, but watch out for Danielle Dorris, her under water is exceptional. She gets out fast. The question is whether or not she can hold it come the back end. Two lengths of this Olympic pool. Danielle Dorris well out in front but we expected this. >> Exactly. Here comes the United States. Weggemann has that really long stroke. She's taking full advantage of her wing span. McKenzie Coan is not going to go down easily, we know what a good competitor she is. But Julia Gaffney is going to be already upset by the 2014ed IM in which she was disqualified. She is the world record hoard and I expect a strong finish from her. >> Danielle Dorris wants to throw a spanner in the works of the her underwater is exceptional. Great power of the legs by the Canadian. There are all sorts of screaming going on here. Shouts of support for the Canadian, but she doesn't have the speed of the Americans. The likes of Gaffney, Weggemann and Coan all trying to close down. Halevi off the pace and Berube out of medal contention. At the moment it looks like Weggemann is making up the most ground. Will she surpass the Canadian? Can Dorris hold on? Will she even hold on for a medal here? It's looking like Weggemann will go to a second gold? It's Paralympic record and win for American Weggemann, Dorris holds on for a Canadian silver. The United States do not get a lock-out of the podium. It's a North American affair as Gaffney manages to finish third and round out the podium that Weggemann tops and Dorris is on. Dorris congratulated immediately by compatriot and veteran of the Paralympic Games, Berube. But for Mallory Weggemann, not perhaps her strongest event but to follow up after the gold in the 100 IM and win, that's a fantastic performance from Weggemann. Three-time Paralympic Games champion. >> Look at her right now, she has to be stoked with that win. She went out, she didn't have the speed, the underwater to match Danielle Dorris, but her backhalf was so strong here. She really made it up in the last 25 metres when she chased down Danielle Dorris. >> Third place and bronze medal for Julia Gaffney, the world record holder. Not near her best. >> No, when you see coming off the wall. Danielle Dorris got off to a huge start as she used the underwater, particularly against the three Americans who just can't match that underwater speed. Danielle Dorris again uses her legs. She centres. Now, coming back it's all about Mallory Weggemann's backhalf and Julia Gaffney also had a very good backhalf, although they couldn't match the early speed of Danielle Dorris, it was in the last 25 metres they went for it. And what a great finish from Mallory Weggemann. Julia Gaffney as well. Julie is probably a little disappointed with that swim, well off her world record, but still, she came in with a bronze medal and a good solid swim. >> Massive