Ship
Cruise ship. A section of passengers are in disguise and plan to take the ship hostage. Or a section of the passengers go rouge and decide to go on a killing spree. The rebel group could be on a suicide mission. My cabin is under my leadership to hold off the attackers, prevent loss of life and escape route. Another ship in the distance has been alerted and the rescue mission is 24-48hrs away. Tempers are rising, time is ticking. PS: Titanic but without the iceberg!! The danger lies within.