Trying to make an adventure

First try at making something swim, and you need to switch layers to get in the vehicle. The there are thrusters to push you down to go through the water. Sorry about the Major lag in the game, please tell me about me any tips for decreasing the lag, I think the transmitters are part, and then the sticky notes. Let me know about any bugs there are. This is still in beta. Remember when in the sub to always pull up the right slider FIRST or when hitting the water, you'll fly out of control over everything and crash way off course in the wrong vehicle. Added bump before publishing online as I tested, you would, when in car, when you get to the unplaced bridge, stop quicker instead of going over.