Surfer Garrett McNamara May Have Conquered His 100-Foot Wave.

After chasing a record-setting wave for a dozen years, the veteran surfer says he may have ridden a 100-foot monster off the coast of Nazaré, Portugal. All that remains now is for Guinness to certify it as a world record.

U.S. surfer Garrett McNamara rides a wave at Praia do Norte beach in Nazaré, Portugal, on Jan. 29, 2013