Piero.
Piero Considers Life Energy is an audiograph found in Dishonored, recorded by Piero Joplin.
Transcript[]
The Academy teaches that absurd idea that the energy in whale oil arises from the need to maintain life functions at the extreme Ocean depths. The pressure and cold are too much to endure without it. I speculate that a human being might, by a process of adaptation, produce high energy humors in the body. I could buy a tank that would slowly increase pressure on a subject over a long period of time, and them [sic] observe them, for years if need be, to see if the formulation of the energetic substance develops. Surely the Empress will be able to furnish me with facilities, a subject, and the necessary legal amnesty.
Location[]
The audiograph can be found in Piero's Workshop after the mission Dishonored.