British explorer Henry Worsley has reposed, in his attempt to be a solo explorer around the South Pole.

The British explorer Henry Worsley, who was trying to be the first person to cross the Antarctic alone and without support, died on Sunday, just 30 miles short of completing his 1,000-mile trek. He was 55.

His death was announced on the website for the expedition, Shackleton Solo, which chronicled Mr. Worsley’s effort to complete Sir Ernest Shackleton’s unfinished journey to cross the Antarctic, which left him and his team stranded in 1915.

Mr. Worsley, who had exhaustion and dehydration, had called for rescue on Day 71 of his journey. He was flown to Punta Arenas, a city in Chile’s southernmost region of Patagonia, the statement said.

Henry makes the courageous call to ALE – picked up safely late afternoon on Day 71  Shackleton Solo (@shackletonsolo) Jan. 23, 2016

He died “following complete organ failure,” said a statement from his wife, Joanna . Mr. Worsley, who had served as a lieutenant colonel in the British Army and was a distant relative to Frank Worsley, the captain of Shackleton’s ship, the Endurance, had published an online diary of his own expedition.

The images and captions detail his efforts in the days before his rescue to keep up his spirits despite hunger, adverse snow conditions and the solitude of his trek.

“Rise to fight again,” said the caption accompanying a photograph posted on Jan. 16 of Mr. Worsley flashing a faint smile , the bleak frozen landscape he would have to traverse visible in the background.

On Jan. 18, Day 66 of his trek, he commented on the “hellish soft snow” as he peered into the camera, his face gaunt and his beard encrusted with snow. Day 68: “Tough old day.”

Mr. Worsley called for help about 30 miles from the end of his journey, which aimed to raise money for the Endeavour Fund in Britain, a project founded to help wounded servicemen and servicewomen.

A statement from the Endeavour Fund said that Mr. Worsley and Joanna had two children, Max and Alicia. Prince William, a patron of the Shackleton Solo Expedition, said that he and his brother, Prince Harry, had lost a friend. “He was a man who showed great courage and determination, and we are incredibly proud to be associated with him,” Prince William said in a statement released by the fund.

In a message published before he was airlifted to Chile for treatment, Mr. Worsley wrote,

“The 71 days alone on the Antarctic with over 900 statute miles covered and a gradual grinding down of my physical endurance finally took its toll today, and it is with sadness that I report it is journey’s end — so close to my goal.”