Tricky questions!

Tricky questions! can you answer them?

. Last year, a cruise ship sank in the middle of the Pacific. Evey single passenger on the ship drowned but only four survived. How's that possible?
What goes up and down, but still remains in the same place?

There is a river. On one side (say side A) a man is standing with a Bengal tiger, a goat, and a bunch of grass. The man has to transport each of them to the other side (say side B) of the river on a boat. Now, the boat can carry one item at a time along with the man. How will he do it? Remember that, the tiger can kill the goat if not attended by the man, and the goat can eat the grass, when left alone.