Here is an article from CNN:
http://www.cnn.com/2012/04/30/world/...html?hpt=hp_c1
"...Investigative journalist Yassin Musharbash, a reporter with the German newspaper Die Zeit, was the first to report on the documents. One plan: to seize passenger ships. According to Musharbash, the writer "says that we could hijack a passenger ship and use it to pressurize the public."

Musharbash takes that to mean that the terrorists "would then start executing passengers on those ships and demand the release of particular prisoners."
The plan would include dressing passengers in orange jump suits, as if they were al Qaeda prisoners at Guantanamo Bay, and then videotaping their execution..."

Now I am not trying to sow anxiety because I think this would be pretty hard to pull off. But I would like to ask the people who have been on the large ships how security is handled. I have only sailed on Windstar. The one time I remember having to clear any kind of security is embarking on the dock in Istanbul. In the caribbean and in central America, we just walked up to the ship and got on the gangplank.
Thanks.