Harry finds polar survival puts him in rather a tight squeeze

After he took the plunge in a bright orange immersion suit, the third-in-line to the throne said: “It’s quite tight on the balls!”

The 26-year-old is in the final few days of training before he joins a group of wounded servicemen for the first five days of their trek to the North Pole.

The Prince leapt bottom-first into an open stretch of water in the Arctic Ocean ice in his fully waterproof suit.

Moments before, he led the Walking with the Wounded charity co-founder Ed Parker to the edge and pushed him in.

Asked what it was like in the minus 1C salt water, the Royal said it was a “silly question”, then joked it was “warm”.

When he first took the plunge, Prince Harry said: “It went up my nose.”

He then said to Mr Parker: “It had to be done.”

Harry looked relaxed when he smiled and joked around as he wallowed in the icy water.

Simon Daglish, the other co-founder of the charity, jumped on top of the prince, splashing the third-in-line to the throne across the face.

Tomorrow the Prince will fly out to the start point of the 200 mile trek through the frozen wasteland.