[elfman2]

"but taking out a ferry is as simple as driving a van or several car-trunks full of explosives on board and setting them off."

Perhaps, It depends on a lot of things.

[Wonder Warthog]

"Perhaps, It depends on a lot of things."

Note, that by "taking out", I am NOT implying that the ferry be sunk. Even a small explosion on the car deck of a ferry will cause severe damage, kill a significant number of people, and generate a lot of "terror" footage (news coverage). Of course, a bigger explosion will do more of the above.