Description Twenty miles off the coast of San Francisco, this small chain of islands hosts a yearly migration of seals.
and during this time of year, the sharks are here too - the biggest, hungriest Great Whites in the world.
Attempting to swim off these shores is attempted suicide.
Colin Mason - wealthy, connected - with one leg bitten off by a white shark in these very same waters - now hosts his own yearly event - a marathon swim through the Great White-infested Farallons, The prize is a million dollars - winner takes all.
How much is your life worth?.