But even still, this ‘mega-island’ was an island and a body of water had to be crossed to reach it from mainland Europe.”
Unless someone could demonstrate that the sea level was less than 5 feet than you need something that floats to cross it.
Again, walking on land is treacherous. The terrain can vary wildly. There are animals or potential ambushes by other hunters. You're limited to what you can carry by the need to keep one hand on your weapon at all times. So much easier to build a boat or raft and cruise offshore, sailing during the day and camping on land during the night. If the weather sucks, you stay put.
Something is wrong here. War, disease, death, destruction, hunger, filth, poverty, torture, crime, corruption, and the Ice Capades. Something is definitely wrong. This is not good work. If this is the best God can do, I am not impressed.
-- George Carlin