(CNN) American endurance athlete Colin O'Brady became the first person to cross Antarctica solo without help after 54 days traversing the barren, frigid continent, he said in an Instagram post.

O'Brady revealed Wednesday that he covered the final 80 miles in one continuous push to the finish line that lasted more than 32 hours.

"FINISH LINE!!! I did it!" he wrote.

A wooden post in the background of the photo O'Brady shared on Instagram, he said, is the edge of the Ross Ice Shelf, which marked the end of his trip.

"As I pulled my sled over this invisible line, I accomplished my goal: to become the first person in history to traverse the continent of Antarctica coast to coast solo, unsupported and unaided," he wrote.