Boyaci ewe, Hext, Kearney, Boggioni, Zhang, Yui and Ozturk. Four lengths of this Olympic-sized pool. 50m is the long course. A handful of the swimmers going for the longer underwater and certainly the longest of the underwaters is Sevilay Ozturk, using her legs to great advantage but street into the stroke and Suzanna Hext and Tully Kearney look to be going out hardest but do not discount, Zhang Li. She went out hard early on and is apparently sitting in second position, coming up to the opening 50. >> Here comes Tully Kearney, though, she hits the first wall out in 35:99. Good for a 50. If there is anyone that can challenge, the 200m mark set in 2,000, it would be Tully Kearney. You know we saw her swim this morning, she went out hard and she seemed to kind of turn it off this second 100. Suzanna Hext was really a lot closer to her than anyone would have expected. But now Tully Kearney is going out, established over a body length of a lead. The only thing that Tully Kearney has to do now is hang on and make sure that every single 50 is very evenly split. That would position herself to challenge that World Record. >> Well, big comparisons have been drawn Beatrice He is,s the French swimmer who shattered all words in Sydney. -- Beatriz Hess. But you have Tully Kearney going out. Someone who has grown up in the same village as Ellie Simmonds. She attended the same school and swam for the same club. Maybe there is some great success in her career in the Paralympic Games. No doubt about her ability in the World Championship level, the European champion, a World Champion. She is leading at the 150 but not swimming away with it. Zhang Li is putting in a dominant display for that silver medal. The challenge for the bronze, really, is now between Boggioni and Hext. >> Here comes Kearney, the last 50. She has to stay out in front there. She is not able to use her legs, so she is relying entirely on her arms. This last 50 becomes very hard to keep your arms, as they start to tighten up, it'll make your stroke shorter and choppier and will make a difference in the water. Tully Kearney for background was a 10, now a 9, now she is a 5. And she is commanding. >> And what a comeback here. Looks like she is trailing off Paralympic World Record pace and Paralympic pace. This is a very fast closing Zhang Li coming in for the gold. She is going to do t she is going to overturn Tully Kearney or will it be the great British swimmer? It is Zhang Li with really a most remarkable comeback to claim gold ahead of Tully Kearney in the fading strokes. Loses out as she claims silver. Boggioni will claim the bronze medal. But what a swim from Zhang. Tully Kearney at one stage in worlder record pace just didn't quite have enough. And the 23-year-old from the People's Republic of China has just come from almost nowhere. She looked like she was holding on through the first 100 for possibly a challenge for the silver. But, a superb back 100 as she claims her fifth Paralympic Games gold medal. Four golds in Rio for Zhang Li. You cannot discount her. She won this event five years ago and she has now successfully defended her title at 2:46:53. She swam 2:48 in Rio but that is a sensational swim. For Tully Kearney, she knows how close that was, 1200ths of a second away from that gold medal. Boggioni, after Hext looked good for a silver, Boggioni came back to claim it. But how about the final 25m. >> It was a fast stroke, Tully Kearney took it out fast but because she is entirely on her arm in the last 50, they tight tend to tighten up to make thor stroke shorter and that gave Zhang the opening she needed. I thought one point that Tully Kearney had it but Zhang overtakes her with a faster stroke, more powerful. She comes in and here she is. And she just outtouches Tully Kearney. The Brits are probably a little bit