The Anglo-Dutch supermajor had spudded the landmark well last weekend after six years, billions of dollars in investment, court challenges and regulatory red tape.
It is the first time a drill bit has touched the sea floor in the US Chukchi Sea in more than 20 years.
Shell uses a combination of satellite images, radar, on-site reconnaissance, and boasts one of the most comprehensive pictures of Arctic sea ice movement in the world at this time.
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