Boat in standard assets water

I have a boat model that I want to place in the standard water asset from unity, how can I make it so the water wont go through the boat?

so you can actually see inside the boat with the boat in the water but the water wont go through it and basically fill it up.

Not got access to Unity but I know there’s a depth mask on the unify community wiki that delays drawing so effectively draws a boat over the water. On my phone and the link keeps screwing up but Google unity DepthMask and it should be first in the results.