From what I can gather, the Mediterrean Sea was formed by a massive flood about 5 million years ago. However, the lowering of sea levels by the ice age glaciations is enough to account for the 40m mentioned, so I assume this is the basis for the interpretation of this object, however speculative it might be.
You mean it got cold, and then warmed up over time? Like all around the globe?
How did the polar bears survive?
//obvious sarcasm