The British explorer Henry Worsley has died during an attempt to become the first person to cross Antarctica alone and unsupported, the BBC reports.

Fifty-five-year-old Worsley was 71 days into the planned 75-day trip. He had managed to cross over 1,700 kilometers while dragging all of his food and equipment, but succumbed to exhaustion and dehydration only 50 kilometers from the end.

The project was undertaken with the goal of raising £100,000 ($142,000 US) for the Endeavor Fund. The Fund assists injured and sick troops.