I've read that there is a continent-sized ocean of water beneath North America and Asia in the layer of the Earth's mantle.
I'll bet it's really briny and salty.
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As far as Ham is concerned, some non-canonical sources speculate that he brought black magic with him from the antediluvian world.
Here is a link to my previous post on the matter, and what I said:
http://www.cathinfo.com/catholic.php?a=topic&t=34311&min=0&num=3**************
Ham smuggled magic past the Flood, according to St. John Cassian...
From Chapter 21 of St. John Cassian's SECOND CONFERENCE OF ABBOT SERENUS. ON PRINCIPALITIES.
"And so, as ancient traditions tell us, Ham the son of Noah, who had been taught these superstitions and wicked and profane arts, as he knew that he could not possibly bring any handbook on these subjects into the ark, into which he was to enter with his good father and holy brothers, inscribed these nefarious arts and profane devices on plates of various metals which could not be destroyed by the flood of waters, and on hard rocks, and when the flood was over he hunted for them with the same inquisitiveness with which he had concealed them, and so transmitted to his descendants a seed-bed of profanity and perpetual sin. In this way then that common notion, according to which men believe that angels delivered to men enchantments and diverse arts, is in truth fulfilled. From these sons of Seth then and daughters of Cain, as we have said, there were born still worse children who became mighty hunters, violent and most fierce men who were termed giants by reason of the size of their bodies and their cruelty and wickedness. For these first began to harass their neighbours and to practise pillaging among men, getting their living rather by rapine than by being contented with the sweat and labour of toil, and their wickedness increased to such a pitch that the world could only be purified by the flood and deluge."