QUOTE : But the real concern is not so much the vulnerability of merchant ships as it is their use by terrorist groups. Osama bin Laden is said to own or control up to twenty aging freighters--a fleet dubbed the 'al Qaeda Navy' by the tabloids. To skeptics who wonder why bin Laden would want to own so many freighters, the explanation quite simply is that he and his associates are in the shipping business. Given his need for anonymity, this makes perfect sense--and it reflects as much on the shipping industry as on al Qaeda that the details remain murky. Such systematic lack of transparency is what worries U.S. officials when they contemplate the sea. The al Qaeda ships are believed to have carried cement and sesame seeds, among other legitimate cargoes. In 1998 one of them delivered the explosives to Africa that were used to bomb the U.S. embassies in Kenya and Tanzania. But immediately before and afterward it was an ordinary merchant ship, going about ordinary business. As a result, that ship has never been found. Nor have any of the others.