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The video is the result of research performed at the MIT Edgerton Center Strobe Laboratory investigating the first signs of failure of thin-walled cylindrical pressure vessels (represented by long thin balloons). Different applications such as powdered sugar and water were used for a better visualization. Theory states that these pressure vessels should split along its horizontal axis rather than ruggedly in half about its vertical axis. This is due to the fact that the hoop stress is twice the magnitude of the axial stress. As shown by the video, the theory holds in the experiment. By: Julia Hsu Supervisor: Dr. Anette Hosoi Thank you: MIT Edgerton Center, Dr. Jim Bales; Chris Tahan; MIT Department of Mechanical Engineering Equipment: Photron Fastcam SA5 1300K-M2 (long-term loan from Photron, thank you Photron!) Aperture: F/1.8 Frame per second setting: 18000fps