User blog comment:Master Sima Yi/Assassinews 03-12-'14 — New Assassin's Creed in Victorian London leaked/@comment-24760042-20141206175535/@comment-13471981-20141206195723

I imagine they did the same to him as they did to Desmond: procure dna samples then zip him up in a body bag. Although, since he was a Sage, they might've done more extensive testing on him.

I doubt that was a literal test tube by the way.