[batonsa]

You can use MoveObject or MoveDynamicObject function to move your submarine, that's up to you to figure out how and where you want it to go. You could create a path for it or a multiple commands for moving it on spot.

And actually, you can attach object to an object with the AttachObjectToObject function - quote from SAMP Wiki:

Quote:

You can use this function to attach objects to other objects. The objects will follow the main object.

And here's the link: https://sampwiki.blast.hk/wiki/AttachObjectToObject