I want to know the answer to the following question:
What conditions caused the delay of drilling in mid-2012?
All the background I'm provided with is that "Further problems hampered the Arctic project after the commencement of drilling in 2012, as Shell dealt with a series of issues that involved air permits, Coast Guard certification of a marine vessel and severe damage to essential oil-spill equipment.". Is that enough to answer the question?
Answer: no