Whale oil.
Whale oil is the refined oil that is harvested from whales, and the basis of Dunwall's industrial revolution. Highly volatile, it is held in tanks which can be found throughout Dunwall, with whale oil being used to power all of the city's technology.
History
Whale oil's potential as an energy source was discovered by the natural philosopher Esmond Roseburrow, who observed vagabonds in Slaughterhouse Row using collected whale oil to stoke fires.[1] Through a special refinement process, he turned whale oil into a fuel source that advanced the Isles' technology by centuries. It also turned the once marginal and supplementary whaling industry into the most vital industry for all the Isles. Whaling houses like the Greaves Company and the Rothwild Slaughterhouse turned into wealthy, industrial powerhouses. Later, Anton Sokolov proposed the first plans to use whale oil in technological weaponization.
Characteristics
Whale oil is easily recognized by the bright blue glow it emits, which can be best seen in the whale processing and oil refining areas of the Greaves Refinery in the Flooded District and in Slaughterhouse Row, where leaked whale oil illuminates the halls and surrounding streets. It is extremely unstable and volatile; throwing or shooting a full whale oil tank will cause it to explode.
It is speculated that whale oil is naturally produced within the bodies of whales due to great pressures deep in the ocean, for the purpose of temperature regulation. It is theorized by Piero Joplin that if the human body were exposed to such pressures, it could produce something similar to whale oil; these experiments have not come to fruition, due to financial and ethical concerns.[2]
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