Aerial photographs taken above eastern Lake Superior show the freighters lined up across a frozen expanse . The ships , carrying raw materials , are being hampered by slabs of ice as big as pick-up trucks , it ’ s been reported . A freighter is seen in this aerial photograph from August 8, 2014 at about 10 a.m. on Lake Superior.
Aerial photographs taken above eastern Lake Superior show the freighters lined up across a frozen expanse . The ships , carrying raw materials , are being hampered by slabs of ice as big as pick-up trucks , it ’ s been reported . Their ability to manoeuvre is extremely limited because the ice is able to penetrate their hulls .