"As a member of the British team, I will have a brew (tea) on ready for you when you join us at the Pole," he said in a speech, referring to participants from other countries.
Harry took part in a 2011 expedition to the North Pole organized by the same charity. Describing qualities he said he admired in his fellow participants, he said: "Physical strength, endurance, a sense of comradeship, absolutely.
"But there's something else, something deeper than that. Something that continues to draw me back to this charity and these people time and again - and always will."