Don't worry. We're just pulling your leg.
When I first got ShipSim2006, there were some challenges where you take a speedboat over ramps, trying to avoid lots of nearby ships. I spent a lot of time seeing how many sailing yachts I could sink with a single jump. I also found that if you reset the game, the ships already sunk stayed that way. So I raced around sinking every ship in the game and seeing how fast I could do that.
In 2006, if you land on the top of another vessel, they sink nicely.
If you want to sink ships, get ShipSim 2006. It's excellent for that. You can get copies quite cheaply I think.