I'll accept the idea of a flood covering a large area, even the size of a country is completely plausible to most people, however the whole world is a different matter. The reason being that for the entire world to be covered in water, it would have been under 5 miles of water since that is the height of Mt Everest. This being the case, it is extremely unlikely that a flood during biblical times could have even come near that. Secondly the huge floods of the past occurred millions of years ago, rather than thousands as in the Bible.
A worldwide flood at any time in history would have not only killed every species, but would have wiped out all human kind as well. The fact is mankind wasn't wiped out at any time is irrefutable evidence that there was no world flood. There have been archaeological findings dating back constantly since the first of our ancestors walked upright, with no gap for the species being on the brink of extinction and then being repopulated. Also, the very largest of cruise liners or shipping boats today would hold less than a thousandth of every species on the planet, let alone every single one. Recent findings have found that there might well have been a large flood in the biblical times in of the size to flood a large area of land, perhaps the size of a country. However this of course didn't cover the entire world, and clearly didn't
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