Why did the Deepwater Horizon explode?

Related questions

1. Do black holes spin?
2. What's past the event horizon?
3. How small would the Earth be in a black hole?
4. How much did BP pay the families?
5. Can a black hole swallow a galaxy?
6. Is there a black hole near Earth?
7. What is a green hole?
8. Do wormholes exist?
9. What is Space Time Really?
10. Are there 12 planets?

Tags

1. #killing
2. #explosion
3. #destroyed
4. #eight
5. #leaks
6. #mexico
7. #accident
8. #failures
9. #investigation
10. #according
11. #people
12. #biggest
13. #history
14. #horizon
15. #drilling
16. #deepwater
17. #leading
18. #catastrophic
19. #awaited