Yes, you generally go through security before boarding a ferry, but the intensity of the screening varies based on the route and the current MARSEC (Maritime Security) level. For international ferries, such as those crossing the English Channel or traveling between countries in Asia, the security process is very similar to an airport: you will likely have your passport checked, pass through a metal detector, and have your luggage X-rayed. If you are taking a vehicle, it may be subject to a manual search or a "canine" inspection for explosives or contraband. For domestic ferries (like those in Seattle, NYC, or the Greek Islands), security is often more discreet. You may encounter "random" bag checks, visible security patrols, and high-definition surveillance, but you might not have to pass through a formal checkpoint every time. Following international maritime laws, ferry operators must maintain a security plan that includes monitoring access points and restricted areas. Even if it feels relaxed, "behind-the-scenes" security measures are always active to ensure the safety of the hundreds of passengers and vehicles on board these large vessels.