Upgrade sliding glass doors to these folding doors: http://www.directdoors.com/exterior-doors-interior-doors-handles-locks-and-all-other-types-of-ironmongery-products/exterior-door-pairs-folding-doors-french-doors-and-patio-doors/trufold-46-supreme-folding-doors-fully-decorated-kfb-p2689
Someone is murdered on the cruise ship you're on. Passengers are told to lock themselves in their cabins and await instructions. The captain speaks from the ships PA system, "The first contestant has fallen. Only 5,132 remain." With that, the doors all click and swing open.