Found some YouTube videos on liquid chlorine releases by the Chlorine Institute. The first video is from the Dugway Proving Grounds and shows how a liquid chlorine release will proceed depending on the direction of the release. I won’t spoil it by yammering on about it.
Lamentations on Chemistry
Editorials of a Scientist Political
Lamentations on Chemistry 
Wow. I watched the first few minutes, got hooked, and stayed for all 28 minutes. Fascinating.
I thought it was fascinating as well. I have done some largish chlorinations using large cylinder scale quantities of chlorine. The self-refrigeration issue is real. The chlorine remaining in the cylinder halfway through the process cooled so much that the Cl2 gas flow rate became a problem. Had to set a heat gun on the floor next to the cylinder to keep the vapor pressure up. The reaction relied on the large exotherm to keep the reaction mass from freezing up.