Submarine

[Tomaz]

If I were you, for anyone whose scripting, Keep it simple, and not full of a ton of useless things.
  Then you could go right over water.
 Make it a bot, and when you crouch, it goes under water, and the water should make it float, thats the simpliest thing you could do, instead of these hacky up downs where people can just fly out of the water.

Good idea, but Im having problems getting add-ons to work.

[Ad Bot]

[Blockoverlord]

Or use DarkStar's building platform script key bind the sub to go up and down etc.

[Reactor Worker]

The model should be "chubby" and use the hatch from JVS doors. Don't forget to have it leave a nice trail of bubbles as it moves.