Proper Course for two things. One is naming Rowing for Pleasure 'best rowing blog on the planet' (Ta very much!) but mainly for drawing my attention to a discussion of Noah's Ark at the National Center for Science Education.
The story of the Flood presents something of a problem for creationists, because the story told in Genesis has quite a lot of detail that can be examined scientifically. Stuff like: "And of every living thing of all flesh, two of every sort shalt thou bring into the ark, to keep them alive with thee; they shall be male and female." This implies, according to NCSE calculations, a manifest of nearly four million creatures, all of whom would have to be loaded in just one day (Gen 7:14).
That is a stupendous size. The Ark would have been the largest wooden ship ever constructed in the history of the world by a very big margin.
Even the monster six masted wooden schooners built at the beginning of the 20th century topped out at about 330ft by 50ft. They used to flex visibly in any sort of sea, the leverage of their enormous length forcing the planks apart so severely they had to be pumped out continously. The biggest of them all, the Wyoming, was lost in a storm on the New England coast despite having anchored to shelter from the blast.
'replica' Ark built in the Netherlands and shown in the pictures is only 150 cubits long, so it can tour the canals. And is not actually a wooden boat at all, but is supported by a steel barge. Could Noah really have built an Ark that size that could have carried the world's life safely through the worst storm of all time?