small arms (usually semi-automatic pistols) stored in a safe accessible only by the captain who distributes them to authorized personnel such as security or the master-at-arms. The ship's high-pressure fire hoses can be used to keep boarders at bay, and often the vessel itself can be maneuvered to ram pirate craft. A recent technology to deter pirates has been the LRAD or sonic cannon which was used in the successful defence of Seabourn Spirit. A related risk is that of terrorism, the most notable incident being that of the 1985 hijacking of Achille Lauro, an Italian cruise ship. Crime on-board Passengers entering the cruise ship are screened by metal detectors. Explosive detection machines used include X-ray machines and explosives trace-detection portal machines (a.k.a. "puffer machines"), to prevent weapons, drugs and other contraband on board. Security has been considerably tightened since 11 September 2001, such that these measures are similar to airport security. In addition to security checkpoints, passengers are often given a ship-specific identification card, which must be shown in order to get on or off the ship. This prevents people boarding who are not entitled to do so, and also ensures the ship's crew are aware of who is on the ship. The Cruise Ship ID cards are also used as the passenger's room key. CCTV cameras are mounted frequently throughout the ship. In 2010, the United States Congress passed the Cruise Vessel Security and Safety Act after numerous incidents of sexual violence, passenger disappearances, physical assault, and other serious crimes. Congress said: Passengers on cruise vessels have an inadequate appreciation of their potential vulnerability to crime while on ocean voyages, and those who may be victimized lack the information they need to understand their legal rights or to know whom to contact for help in the immediate aftermath of the crime. Congress said both passengers and crew committed crimes. It said data on the problem was lacking because cruise lines did not make it publicly available, multiple countries were involved in investigating incidents on international waters, and crime scenes could not be secured quickly by police. It recommended that owners of cruise vessels: install acoustic hailing and warning devices capable of working at a distance. install more security cameras install peep holes in passenger room doors limit access to passenger rooms to select staff at specific times After investigating the death of Dianne Brimble in 2002, a coroner