ya they dun eat human perhaps.....
but if u swim and they happen to swim in ur direction and
yawn.....
then....... 
killer whale throw their food and play with it (seals) till they
die b4 consume them....
and do u know tat gaint squirt actually exist but they live deep
below the ocean.
and not forgeting sharks, jellyfish, sea snake(tu long).
i think if u see a big fish( ju4 long2) tat is around the same size
as human.
u will sweat already.....
cos one thing is in sea our mobility is less than half of wat we do
on ground....
so tat makes us a sitting duck or easy prey.
