Even if you melted all of the current ice in the world it would not raise ocean levels even close to 13,000 feet so where is all of that extra water?
Give it up man, you will find out during judgement when you bow and confess Jesus is Lord.
The water on the surface of the earth is not the whole story. There is MUCH MORE water within the mantle of the earth — perhaps 5 times more within than on the surface.