The invention discloses devices and methods for analyzing inbound and outbound ships for illegal or dangerous cargo or persons. An arch is generally placed several kilometers from shore, the arch including a plurality of distinct analytical and diagnostic equipment. A ship passing through the arch is analyzed by photographic, thermal and other means for presence of explosives, nuclear, chemical, or biological agents, terrorists, contraband, illegal passengers and/or other potential threats. Results from scanning are sent to appropriate security officials as are data of ships that attempt to circumvent the security arch.