https://youtu.be/tekV3IRyvyY?t=4100
I really like the idea of continents and how ocean is going to limit fast travel and make it challenging getting from one body of land to another, and all the fun implications it would have on the game(naval warfare, intercontinental trade). However, unless the space beneath the ocean is made unminable, this whole thing - dead on arrival. What's the point of wasting time sailing, when an underground road is instant and 100% safe. I give it 2 months tops before people connect all the continents with tunnels, and then just use them.
And please don't consider half measures like making it x10 harder to mine under sea or even disabling fast travel underground - people will still prefer tunnels.