Aerial photographs taken above eastern Lake Superior show the freighters lined up across a frozen expanse . The ships , carrying raw materials , are being transported by sheets 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 hull .
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 .