CSB has released a 5-minute video that recreates the Tesoro Refinery explosion and fire, which occurred on April, 2, 2010, in Anacortes, WA. The computer-animated video shows the process of high temperature hydrogen attack, which according to the agency, damaged and weakened a nearly 40-year-old carbon heat exchanger. This damage led to the explosion, which could have been prevented had the company replaced the exchanger with a safer alloy model. Visit CSB to view the video.