I have first hand experience with Shell of what Sherman wrote. I flew a contract (luckily only for two weeks) for Shell and can only agree, they are extremely anal and demanding regarding the expectation on contractors and can be very difficult to work for. As far as their own oil exploration operation I was less than impressed to say the least. I'm all for safety but they went so far making it almost impractical flying for them. Luckily I "missed" their audit of this particular operation
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Oil companies in general are tough on safety, but Shell takes the cake.