Some Plz Help Me!! Gaaahhhhh!!!

[DarthXavier]

Can some one plz help me, I am playing agent underfire and am up to the underwater passage level(you know where you are on the lil car that wisks you allong a track?), i get to the end ok, where i cirlcle round and round, but i always always die cuz i get , um i dont know "burned" by the lava, i get the golden rocket launcher but what do i do to get out of there? once again i am stuck at the end of the level where you circle round and round, can someone plz be kind enuff to tell me How the heck to get off this level, i mean complete it?
Thanks pals