What I mean is not the actual wave, but more like the "splashes" of something heavy getting into the water. I read this in an article in FSM, it was about a dio of a amphibian vehicle nose in the water, back still on land...
It's hard to explain, English is not my first language, and I don't remember what issue of FSM I read it in, it's been a while, mayby two years ago or so.
The author carved the inner shape of the splash from patato, applied the "water" and after drying it was easy to remove the patato.