Okay...my bad.
Diluted bitumen is a mixture of bitumen (heavy, molasses like, and sticky) and a lighter diluent (basically naphtha) that thins it enough so it can flow through a pipeline.
When first spilled the diluted bitumen doesn't sink, but after a day or so the diluent evaporates off and the rest, the bitumen, sinks to the bottom. Like in the Kalamazoo River where they're still finding it on the bottom.
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