Exxon still uses one-hull tankers 20 years after Valdez

Alaskan fisherman J.R. Janneck


Even after 79 percent of the world supertanker fleet has been replaced by craft with two hulls, Exxon Mobil Corp. remains the biggest Western user of the older designs. It hired more of the tankers last year than the rest of the 10 biggest companies by market value combined, according to data compiled by Bloomberg.

Exxon, the world