In this Dec. 29, 2012 file photo provided by the United States Coast Guard, the tugs Aiviq and Nanuq tow the mobile drilling unit Kulluk 80 miles southwest of Kodiak City, Alaska. A spokesman for Shell Alaska says the company in the next few weeks will submit an Arctic offshore exploration plan but hasn’t decided whether it will move forward with drilling next year. (AP Photo/United States Coast Guard, Petty Officer 1st Class Sara Francis)