us submarine navigating off the coast of portugal with coastal buildings in view

marin ship submarine metal boat naval army weapon armoring war fight wallpaper battle gun military sailing nuclear floating transport portugal coast maritime ocean sea level buildings coastal underwater aquatic vessel navigation waterfront harbor seascape technology transportation safety defense infrastructure scenery marine industry landscape waves exploration fleet troops port cityscape traditional modern vibrant community action travel navigating view cruises 39aph39 coastline colorful rising waterline background