Blue Stinger Swimming mode how to swim?

Hi i have a question i hope some of you can help me with, I have tried to get the Swimmer mode in Blue Stinger, the mode were you are suppose to be able to swim pushing the red controler button, but i am not sure if this mode is real or not, does anyone know if this mode is just bogus cus all i have been able to unlock is a mode were it says swimmer underneath the healthbar and Eliiot is only wearing some boxershorts with the american flag on them, is this the correct mode, caus when i push the red button he does not swim, i read on a few cheatsites that this should be possible, can anyone comfirm that this should be possible.