Olympic hopeful Nick Dempsey is concerned his bid for gold at the Rio 2016 Olympic Games will be undone by a plastic bag floating in polluted waters.Britains sailors have spent a lot of time training in Guanabara Bay, trying to predict the climate patterns, tides and currents to aid their bid for glory next month.Yet Dempsey, who has been to Rio four times this year for two-week stretches, reckons the water quality is deteriorating and that someones medal chances in the RS:X mens windsurfer class in which he competes will be ended by debris in the water.Norwich-born Dempsey, who claimed silver at the London 2012 Olympics, said: Someone will lose a medal because of hitting something in the water.Its hitting the plastic bags in the water thats the problem. You stop, thats 10 places gone and youre not getting that back.Its going to happen -- its just how many times it happens to you. Its just going to be luck as to who gets the most plastic bags, hits a crate and that sort of stuff.Polluted waters can cause illness, too, and Dempsey, who returned from his most recent trip last Thursday, has not noticed an improvement despite the Games looming large.He added: Theres no improvements. Its worse. It was probably the worst its ever been last week. Its just rubbish in the water, everywhere. Its a bit of a nightmare. Theres nothing [the Rio 2016 organisers] can do about it. Its a huge, massive infrastructure problem.Dempseys training includes dealing with hitting debris, which is not difficult to incorporate when it happens so often.It happens every day in training, maybe three times that were racing that we have to stop, he added. Its become such a part of it that we do practice stopping, getting something off quickly and going again.You have to completely stop, reverse, go sideways and it generally comes off straight away. Its quite a slow process. Its going to happen at a crucial moment. Youve just got to get it off quickly.If it happens at the start line you will not finish top 15. Thats your race done.Windsurfers are affected more by the debris due to the light weight of their vessel, while dinghy sailors can be soaked due to their low position on the water.?The British sailors are doing anything possible to combat the threat of illness and expressed regret more has not been done to clean up the bay.Nick Thompson, world champion in the laser, said: When it rains a lot theres a lot of pollution in the water.Its a bit of a shame they havent taken the opportunity to clean the waters up a little bit more.Hannah Mills, London 2012 silver medalist in the 470 with Saskia Clark, said: Were a bit sad that hasnt happened.British Sailing team manager Stephen Park hopes a final clean-up will still take place and says that contingency measures are available so the level of debris does not affect the racing unduly.Some of that rubbish tends to lie in particular areas because of the way the water moves, Park said.If youve got to go across that line, as you approach that point youre looking closely in the water to see if you can avoid something.World Sailing are very conscious of that and if they think the rubbish is particularly bad, theyll probably move some racing to different courses. 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