The blocks you see underwater looks like a reflection of the land.
Yeah, I thought so too.
In point of fact, it shows that I need to add a refractive index to the water shader so that you can't see those formations underwater. a) it's unrealistic in this case, b) it unnecessarily shows how the local terrain chops off arbitrarily.
It is pretty unrealistic. You can't see the bottom of a river even on a clear day. Unless that water was clear, actually. What would the terrain look like in multiplayer if someone was editting it? Would you see the terrain changing?
Edit: I wonder if you even know what it's like