Andrew Cotton rode a wave off the coast of Portugal that was believed to be 98-feet tall.
If this is true, the current world-record holder would break the record he set three months ago of 78-feet.
To put these massive waves in perspective, the ones at the Mavericks Invitational surf contest this year were about 40-feet tall.
Cotton said the wave was intimidating.
Judges will decide in March if it's a world record.