It's currently unclear what exactly caused Saturday's Boeing 777 crash at San Francisco International Airport, which killed two passengers and injured many more. What is clear, according to survivors, was how inevitable the crash seemed just before it happened. The plane was flying dangerously low—lower than it should have been at that point in the descent—before it slammed into the tarmac and seemed to explode in a fireball, throwing passengers onto the runway. Two of those passengers, teenage girls from China, were killed. "There was a fire on the plane, so the assumption might be that they went near the water's edge," speculated San Francisco’s fire chief, "to maybe douse themselves with water."