[twntaipan]

It sounds to me like they are filming the interiors for purposes of building a mock up of the vessel. That could be used for preparing a hi-jacking of a ferry and killing the passengers. Muslim terrorists have hit ships and boats before (in the middle east) because they are relatively defenseless.

[TomGuy]

A ferry filled with people would make for an ideal hostage situation. Just think, they capture a ferry, threaten to kill off passengers one at a time, one every hour until The Blind Shiek is released. [They are suicidal anyway, so if they run out of passengers to kill and they end up dead themselves, they have managed to "take" a number of dead with them.]

Potential senerios of disruption and threat are numerous and endless.