There are many strange ideas about the flood that are usually an attempt to reconcile secular dating methods. These methods are always dubious at best, and are often over turned by further research. However, Christian’s still like to compromise.
One of these compromises is the concept that at least one of the Egyptian Pyramids found in Giza / Cairo today, were built before the flood.
But is that even possible? I believe after reading the genesis account and then the following account from SOP, you will see there is absolutely no way anything could have survived this event. And if this account isn’t enough, there is a final nail in the coffin of this theory to conclude.