I forgot to add that the reason so many people died is because there was a huge load of WWII left-over ordinance stored on deck at the time and the first blast put holes in all of the fire hoses
They show this film to you when they send you to firefighting school and also in boot camp. It is horrendous and scarier than a movie because it is real. There is one moment where a chief is running up with a fire extinguisher and then a horrific blast. He is gone - blown away!