Saab’s Karslkrona, Sweden, shipyard yesterday launched the submarine HMS Halland following a comprehensive mid-life upgrade.

Military submarines use red light instead of fluorescent or other light types for specific, scientific reasons. Here's ...

Some can't imagine sailing in an interior with no outside source of light. Others love interior cabins because the sun never wakes you up. Related: Royal Caribbean and Carnival 1 vote away from new ...