Shell has demonstrated its competency at operating in those waters. One of its rigs simply got away and grounded (you might consider what that might have produced had it been a tanker), and their navigation material is so poor that they struck something large enough with enough force to tear a three foot hole in a ICE BREAKER, a vessel specifically ARMORED below the waterline for the purpose of smashing through ICE.
"Her ice class, POLAR-10, means that her hull is strengthened for unassisted operation in the Arctic, sub-Arctic and Antarctic regions, where the vessel can encounter winter ice with a nominal thickness of 1 metre (3.3 ft), pressure ridges, multi-year ice floes and glacial ice inclusions. The additional class notation "Icebreaker" states that she has no limitations for repeated ramming."
Ships for navigation in ice, Pt.5 Ch.1 Sec.4 A303. Det Norske Veritas, January 2005.
With that record I think it's utterly foolish to turn them loose in one of the most pristine environments on the planet to poke holes in the bottom trying to find crude oil to suck up.