he can stay with him until the final 100. Alex Portal of France is 19, brash, he missed out on a medal in the 100 fly by a finger nail or two. And now he has a chance. Getting off to a very good start is Jason. He's 23. Boki, phenomenal under water and immediately gets into his stroke. He's not going to be going out quite so hard, but I wonder how Alex Portal is going to take this race and how Garaschenko is going to take this race. They swim on either side of the favourite for the gold, the world champion, the world record Holder, the double defending champion in this event, the 400 free S13. >> During preliminaries, we saw Alex Portal go out quite quickly. Right now he seems to be hanging on Boki's shoulder, same with Garaschenko. He'll come up a bit more I think Garaschenko and may take the lead in the second and third 100. Here he goes at the turn. May be slightly ahead of Boki. Boki has that very calm and controlled, very wide stroke. Then he comes into the first 100 and he really takes advantage of that under water. Right now, Boki has the slight lead. Garaschenko is hanging with him. >> Cock Boki is ahead. Not by much. This is for the S13. These are swimmers who often still have either the central or peripheral vision, although very limited. Boki is leading the way ahead of Garaschenko and Portal. >> It's great that he has the other swimmers pushing him. Boki, we don't normally see him challenge. Most of the time he's got clean water on either side of him. We knew Garaschenko would be a threat. Portal at this point during the preliminaries, he's starting to fade and now he's trying to hang in there to Boki's waist at the moment. During the length of the lap itself, he has to try to make up some ground. He doesn't have Boki's turns. >> That will be a weak understand for Portal, the engineering student. A wonderful story. His roommate at university is a certain Ugo DeG ie r. >> Look at this under water, it's great. Garaschenko, normally he's able to either get ahead or he's just hanging with him which is what he's doing at this point go ..ing into the final 100 is normally where Boki takes off. Let's see if he can do it enagain. Ing. Into the final 100 is normally where Boki takes off. Let's see if he can do it enagain. He need to try to bring it home. And now, with 100m to go, he's looking to try to get away from Garaschenko. But Garaschenko showing the ultimate tenacity here in just holding on Boki will be starting to get a bit disgruntled. >> Here we go. Boki is starting to increase his stroke. There he goes. Now Boki puts his legs into it. Garaschenko likely is unable to keep up. There goes Boki. Increases his stroke rate. >> Now he has clean water again and reminds the entire world of what quality he possesses. Ihar Boki, he has 13 golds, one silver and one bronze, he's about to win the milestone 14th gold. He doesn't do it in world record time but he gits gold. A fine silver for Garaschenko and what a bronze for the young talent that is Alex Portal. To be able to keep pace with Boki. Very impressive. Roommate will be looking on. One apiece. Portal has the bronze. Boki, three events. 14 golds at the Paralympic Games, only in his third. Mike Kenny had 16 in four, Dias has 14 as well. Only Mike Kenny has more golds now than Ihar Boki. Wonderful swim from Garaschenko to stay as close as he did for Ihar Boki for as long as he did. In the end, he was the class that is just on displayorhe world to see. Ihar Boki in 17 events. 16 medals, 14 golds. By the end of the games he could be the most successful male paralympian of all-time based on gold medals won. >> Ihar Boki, to break down the 400m freestyle, swims with such experience, keeps the control, he doesn't panic when the opponents are hanging with him. Boki, on the last turn, here he goes, he really uses the most of the under water and pops up way ahead of anyone else to get that clean water. Then he turns his legs on,