1000000 litre aquarium exploded!

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Although they really don't know what happened, "material fatigue" has been mentioned as the probable cause. Yikes!
 
Looks like acrylic to me.
 
Can anybody explain or speculate why the acrylic totally broke?
In the video it looks like nothing from the outer wall is standing anymore. I would have expected it to crack or break at one point and some cracks spreading from there while the water runs out.
 
MonsterFishKeepers.com