Possible is almost everything.
You just need training, a target, motivation and much time.
Have a look here:
http://war-ace-campaign.webnode.at/n...r-player-subs/
This is also possible for ships but unfortunately they get damage once they are partly under water.
For bigger waves have a look into the scene.dat file and work at the wind properties. I think the y value is responsible for the height.
Regards