Re: Huricane deck boat sunk I need to know why, please help
You need to make sure that your transom isn't rotted and allowing water in. Inspect the drain tube by pulling the plug out and see if it moves, even just a little. Do the same for those two "extra thru-hulls" you've described (be best to post up a picture or two of your boat and then of that area...include the whole stern if you can). Had your boat been sitting in the water before you took off, or this happen immediately after you launched it from a trailer? If it was, in fact, in the water, had it been raining at any point before you took of in it?
Is there any chance it had the plug in while on the trailer and got rained on? I'm asking these questions because if the boat had filled will some water, you might not have noticed it above deck, and that extra weight upon take-off allowed those through-hulls to go under the water, when they normally wouldn't be. A lot of water weight can build up before you know it. By running it with the nose up, that could've also kept those through-hulls underwater, coupled with the amount of water than comes over the stern when stopping abruptly, it all adds up quickly.