Oubliette

A Oubliette is a room or cell in which prisoners are held, especially underground. Oubliettes are generally associated with medieval castles, though their association with torture probably belongs more to the Renaissance period. An oubliette is a form of dungeon which is accessible only from a hatch in a high ceiling.

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Meltwater Abstract

Meltwater is the water released by the melting of snow or ice, including glacial ice, tabular icebergs and ice shelves over oceans. Meltwater is often found in the ablation zone of glaciers, where the rate of snow cover is reducing. Meltwater can be produced during volcanic eruptions. When meltwater pools on the surface rather than flowing, it forms melt ponds. As the weather gets colder meltwater will often re-freeze. Meltwater can collect or melt under the ice's surface. These pools of water, known as sub-glacial lakes can form due to geothermal heat and friction.