Why do bodies decompose to liquification in an enclosed space? (CSI S2E4)

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I’m recently rewatching the oldest seasons of CSI. In this episode, a human body was dumped in a zipped up duffel bag. Months later when it was found, it’s turned into soup.

No organs, just bones, and lots of goop made up of human fat. Why is this so? In the episode, aside from saying it’s due to decomposition in an enclosed space, they don’t elaborate.

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