well i just panic like heck!! Swim around clueless and look for the nearest piece of kelp to climb up.. if nothing like that.. well then i just breathe out all my air so have to fight it harder to get to the top quicker!! HAHAHA
Ja Peter has pretty much got it waxed.. hes good at getting you right into the impact zone also

So easy training with Peter...haha
Ja just count wave gaps between them and work out how long you have to break the surface before the next one hits. Most times its 10-15 secs longest which feels like ever. But ja dont panic and go along with it...
Also when its 8-10ft plus (Thats not Kalkbay size) its basically impossible to duckdive or not get a good thrashing... so if you cant beat it..... JOIN IT!! and have fun seeing how many rolls, backflips, spins you can do under the water... Sometimes just take the biggest one and have the worst wipe out .. and ja most of the times thats the worst you are going to go through..
Good times and try surf with someone when its big just incase!!
Peace out
Mark