You wonder what something that big eats when it's really hungry!
seals, sea lions,
pinnipeds mostly,
fish
albatross fledglings (or is that Tiger sharks ?)
the occasional dead floating whale carcasses
(I saw that once, off the Farallon Islands going Deep Sea fishing,
rockfish/cod/snapper or Salmon Fishing out of SF Bay on the 'Eddybob'
it was freaken' amazing to watch)
or seal decoys they tow behind boats
(usually too small of a boat IMO)
to document/photo/film breaching/hunting activities
all that damn chum & bait
they use off the research boats
or the occasional surfboards/surfers, they like to take bites out of
the real apex predator of the sea is Orca/Killer Whales
they will kill & even eat Great Whites if they can, they love the huge livers
(& fava beans
Hannibal Lechtor reference)
I saw it on Science or Discovery channel
happened outside of Monterey Bay IIRC