does anyone know if it is possible to drive through the tunnel or if you have to put your car on a train?

Nope, there's a driving tunnel too. :)

great could you tell me a little more about it ,how much it costs,where it leaves from e.t.c because i cant find any info about the driving tunnel.

im affraid u have to put your car on train there is no driving tunnel, normally takes 35 mins

hope this helps