The western continent of Yokuda, which sank into the sea in ancient times, was the original home continent of the Redguards. Its destruction was either the result of earth tremors or was caused by the Redguards themselves. Yokuda was the scene of frequent warfare, and there are tales blaming the cataclysm on a rebel band of Ansei, magical swordsmen whose secret techniques are reputedly capable of such devastation. In any event, the Redguards themselves seem to be under the impression that the destruction of Yokuda was in some way their fault. Upon the sinking of their homeland, which apparently was predictable to some degree, the Yokudan fleet set sail to the east, where they shored at the continent of Tamriel in the province of Hammerfell.

Although Yokuda no longer exists, it is included on one map of Western Tamriel. Also, according to residents of Anvil, ships still sail to Yokuda from Anvil.

Here is the link to the map of Yokuda.
http://www.uesp.net/wiki/File:Tam-Maps-West_Tamriel.jpg

I read that Yokuda sank due to a nuclear (or thermo-nuclear, I don't know what the difference is) mistake. Something like "they split that which must not be split" which I translate into splitting the atom.

hm.... could be translated into a few diffrent things i supose... coulda split with thier gods... and were sunk because of that aswell (i do not know wat the dif is either in ur theory.. i belive one uses more heat? or they may be the same... not sure )

but yes... i remember reading that somewhere that they were sunk to the ocean floor or like there of...

According to your other lore thread, the one about Dwemer, there's evidence suggesting the Dwemer lived on Yokuda. Maybe the Redguard found a dwarven lab and accidentally activated something.

hm... now that is a very likely possiblity, the "knowledge" of the dwemer is lost just as their race is.... hehe

intersting theories there mate but geuss we shall not know.. hehe unless tes V delvs into that, but not interily sure